diff --git a/pkg/tfbridge/provider_test.go b/pkg/tfbridge/provider_test.go
index 77ec0ee14..528397714 100644
--- a/pkg/tfbridge/provider_test.go
+++ b/pkg/tfbridge/provider_test.go
@@ -4535,3 +4535,1087 @@ func TestPlanResourceChangeStateUpgrade(t *testing.T) {
 		}
 	}`)
 }
+
+func UnknownsSchema() map[string]*schemav2.Resource {
+	return map[string]*schemav2.Resource{
+		"example_resource": {
+			Schema: map[string]*schemav2.Schema{
+				"set_prop": {
+					Type:     schema.TypeSet,
+					Optional: true,
+					Elem:     &schemav2.Schema{Type: schemav2.TypeString},
+				},
+				"set_block_prop": {
+					Type:     schema.TypeSet,
+					Optional: true,
+					Elem: &schemav2.Resource{
+						Schema: map[string]*schemav2.Schema{
+							"prop": {
+								Type:     schema.TypeString,
+								Optional: true,
+							},
+						},
+					},
+				},
+				"string_prop": {
+					Type:     schema.TypeString,
+					Optional: true,
+				},
+				"list_prop": {
+					Type:     schema.TypeList,
+					Optional: true,
+					Elem:     &schemav2.Schema{Type: schemav2.TypeString},
+				},
+				"list_block_prop": {
+					Type:     schema.TypeList,
+					Optional: true,
+					Elem: &schemav2.Resource{
+						Schema: map[string]*schemav2.Schema{
+							"prop": {
+								Type:     schema.TypeString,
+								Optional: true,
+							},
+						},
+					},
+				},
+				"nested_list_prop": {
+					Type:     schema.TypeList,
+					Optional: true,
+					Elem: &schemav2.Schema{
+						Type:     schema.TypeList,
+						Optional: true,
+						Elem:     &schemav2.Schema{Type: schemav2.TypeString},
+					},
+				},
+				"nested_list_block_prop": {
+					Type:     schema.TypeList,
+					Optional: true,
+					Elem: &schemav2.Resource{
+						Schema: map[string]*schemav2.Schema{
+							"nested_prop": {
+								Type:     schema.TypeList,
+								Optional: true,
+								Elem: &schemav2.Resource{
+									Schema: map[string]*schemav2.Schema{
+										"prop": {
+											Type:     schema.TypeString,
+											Optional: true,
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+				"max_items_one_prop": {
+					Type:     schema.TypeList,
+					Optional: true,
+					MaxItems: 1,
+					Elem:     &schemav2.Schema{Type: schemav2.TypeString},
+				},
+				"max_items_one_block_prop": {
+					Type:     schema.TypeList,
+					Optional: true,
+					MaxItems: 1,
+					Elem: &schemav2.Resource{
+						Schema: map[string]*schemav2.Schema{
+							"prop": {
+								Type:     schema.TypeString,
+								Optional: true,
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+}
+
+func TestUnknowns(t *testing.T) {
+	// Related to [pulumi/pulumi-terraform-bridge#1885]
+	// This test is to ensure that we can handle unknowns in the schema.
+	// Note that the behaviour here might not match TF and can NOT match TF completely
+	// as HCL has no way of expressing unknown blocks.
+	// We currently have a workaround in makeTerraformInputs where we convert unknown blocks
+	// to blocks of unknown.
+	//
+	// The structure is that for each property we inject an unknown at every level.
+	// For the block tests:
+	// _subprop is an unknown for the subproperty in the block object
+	// _prop is an unknown for the whole block
+	// _collection is an unknown for the whole collection
+	// The nested match the above convention but also iterate over the nested object.
+
+	p := &schemav2.Provider{
+		Schema:       map[string]*schemav2.Schema{},
+		ResourcesMap: UnknownsSchema(),
+	}
+	shimProv := shimv2.NewProvider(p, shimv2.WithPlanResourceChange(func(tfResourceType string) bool { return false }))
+	provider := &Provider{
+		tf:     shimProv,
+		config: shimv2.NewSchemaMap(p.Schema),
+		info: ProviderInfo{
+			P:              shimProv,
+			ResourcePrefix: "example",
+			Resources: map[string]*ResourceInfo{
+				"example_resource": {Tok: "ExampleResource"},
+			},
+		},
+	}
+	provider.initResourceMaps()
+
+	t.Run("unknown for string prop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"stringProp":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":""
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for set prop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"setProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":""
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for set block prop subprop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"setBlockProps":[{"prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":""
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for set block prop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"setBlockProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":""
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for set block prop collection", func(t *testing.T) {
+		// TODO[pulumi/pulumi-terraform-bridge#1885]
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"setBlockProps":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"",
+				"setBlockProps":[{"prop":""}]
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for list prop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"listProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id": ""
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for list block prop subprop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"listBlockProps":[{"prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"",
+				"listBlockProps":[{"prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}]
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for list block prop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"listBlockProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":""
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for list block prop collection", func(t *testing.T) {
+		// TODO[pulumi/pulumi-terraform-bridge#1885]
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"listBlockProps":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"",
+				"listBlockProps":[null]
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for nested list prop", func(t *testing.T) {
+		// The unknownness gets promoted one level up. This seems to be TF behaviour, independent of PRC.
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"nestedListProps":[["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"",
+				"nestedListProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for nested list block prop nested subprop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"nestedListBlockProps":[{"nestedProps":[{"prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}]}]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"",
+				"nestedListBlockProps":[{"nestedProps":[{"prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}]}]
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for nested list block nested prop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"nestedListBlockProps":[{"nestedProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]}]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"",
+				"nestedListBlockProps":[{"nestedProps":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}]
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for nested list block prop nested collection", func(t *testing.T) {
+		// TODO[pulumi/pulumi-terraform-bridge#1885]
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"nestedListBlockProps":[{"nestedProps":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"",
+				"nestedListBlockProps":[{"nestedProps":[null]}]
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for nested list block prop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"nestedListBlockProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":""
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for nested list block prop collection", func(t *testing.T) {
+		// TODO[pulumi/pulumi-terraform-bridge#1885]
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"nestedListBlockProps":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"",
+				"nestedListBlockProps":[null]
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for max items one prop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"maxItemsOneProp":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":""
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for max items one block prop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"maxItemsOneBlockProp":{"prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"",
+				"maxItemsOneBlockProp": {"prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for max items one block", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"maxItemsOneBlockProp":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":""
+			}
+		}
+	}`)
+	})
+}
+
+func TestPlanResourceChangeUnknowns(t *testing.T) {
+	// Related to [pulumi/pulumi-terraform-bridge#1885]
+	// This test is to ensure that we can handle unknowns in the schema.
+	// Note that the behaviour here might not match TF and can NOT match TF completely
+	// as HCL has no way of expressing unknown blocks.
+	// We currently have a workaround in makeTerraformInputs where we convert unknown blocks
+	// to blocks of unknown.
+	//
+	// The structure is that for each property we inject an unknown at every level.
+	// For the block tests:
+	// _subprop is an unknown for the subproperty in the block object
+	// _prop is an unknown for the whole block
+	// _collection is an unknown for the whole collection
+	// The nested match the above convention but also iterate over the nested object.
+
+	p := &schemav2.Provider{
+		Schema:       map[string]*schemav2.Schema{},
+		ResourcesMap: UnknownsSchema(),
+	}
+	shimProv := shimv2.NewProvider(p, shimv2.WithPlanResourceChange(func(tfResourceType string) bool { return true }))
+	provider := &Provider{
+		tf:     shimProv,
+		config: shimv2.NewSchemaMap(p.Schema),
+		info: ProviderInfo{
+			P:              shimProv,
+			ResourcePrefix: "example",
+			Resources: map[string]*ResourceInfo{
+				"example_resource": {Tok: "ExampleResource"},
+			},
+		},
+	}
+	provider.initResourceMaps()
+
+	t.Run("unknown for string prop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"string_prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":[],
+				"nestedListBlockProps":[],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for set prop", func(t *testing.T) {
+		// The unknownness gets promoted one level up. This seems to be TF behaviour, independent of PRC.
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"setProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":[],
+				"nestedListBlockProps":[],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for set block prop subprop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"setBlockProps":[{"prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[{
+				  "prop": "04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+				}],
+				"listBlockProps":[],
+				"nestedListBlockProps":[],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for set block prop", func(t *testing.T) {
+		// TODO[pulumi/pulumi-terraform-bridge#1885]
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"setBlockProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[{"prop":""}],
+				"listBlockProps":[],
+				"nestedListBlockProps":[],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for set block prop collection", func(t *testing.T) {
+		// TODO[pulumi/pulumi-terraform-bridge#1885]
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"setBlockProps":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[{"prop":""}],
+				"listBlockProps":[],
+				"nestedListBlockProps":[],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for list prop", func(t *testing.T) {
+		// The unknownness gets promoted one level up. This seems to be TF behaviour, independent of PRC.
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"listProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"maxItemsOneProp":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":[],
+				"nestedListBlockProps":[],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for list block prop subprop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"listBlockProps":[{"prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":[{
+					"prop": "04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+				  }],
+				"nestedListBlockProps":[],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for list block prop", func(t *testing.T) {
+		// The unknownness gets promoted one level up. This seems to be TF behaviour, independent of PRC.
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"listBlockProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"nestedListBlockProps":[],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for list block prop collection", func(t *testing.T) {
+		// TODO[pulumi/pulumi-terraform-bridge#1885]
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"listBlockProps":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":[{ "prop": null }],
+				"nestedListBlockProps":[],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for nested list prop", func(t *testing.T) {
+		// The unknownness gets promoted one level up. This seems to be TF behaviour, independent of PRC.
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"nestedListProps":[["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"maxItemsOneProp":null,
+				"nestedListProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"],
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":[],
+				"nestedListBlockProps":[],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for nested list block prop nested subprop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"nestedListBlockProps":[{"nestedProps":[{"prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}]}]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":[],
+				"nestedListBlockProps":[{
+					"nestedProps": [
+						{"prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}
+					]
+				  }],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for nested list block prop nested prop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"nestedListBlockProps":[{"nestedProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]}]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":[],
+				"nestedListBlockProps":[{
+					"nestedProps": "04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+				  }],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for nested list block prop nested collection", func(t *testing.T) {
+		// TODO[pulumi/pulumi-terraform-bridge#1885]
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"nestedListBlockProps":[{"nestedProps":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":[],
+				"nestedListBlockProps":[{
+					"nestedProps": [{"prop":null}]
+				  }],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for nested list block prop", func(t *testing.T) {
+		// The unknownness gets promoted one level up. This seems to be TF behaviour, independent of PRC.
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"nestedListBlockProps":["04da6b54-80e4-46f7-96ec-b56ff0331ba9"]
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":[],
+				"nestedListBlockProps":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for nested list block collection", func(t *testing.T) {
+		// TODO[pulumi/pulumi-terraform-bridge#1885]
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"nestedListBlockProps":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":[],
+				"nestedListBlockProps":[{"nestedProps":null}],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for max items one prop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"maxItemsOneProp":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"setBlockProps":[],
+				"listBlockProps":[],
+				"nestedListBlockProps":[],
+				"maxItemsOneBlockProp":null
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for max items one block subprop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"maxItemsOneBlockProp":{"prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":[],
+				"nestedListBlockProps":[],
+				"maxItemsOneBlockProp":{"prop":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"}
+			}
+		}
+	}`)
+	})
+
+	t.Run("unknown for max items one block prop", func(t *testing.T) {
+		testutils.Replay(t, provider, `
+	{
+		"method": "/pulumirpc.ResourceProvider/Create",
+		"request": {
+			"urn": "urn:pulumi:dev::teststack::ExampleResource::exres",
+			"properties":{
+				"__defaults":[],
+				"maxItemsOneBlockProp":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+			},
+			"preview":true
+		},
+		"response": {
+			"properties":{
+				"id":"04da6b54-80e4-46f7-96ec-b56ff0331ba9",
+				"stringProp":null,
+				"setProps":null,
+				"listProps":null,
+				"nestedListProps":null,
+				"maxItemsOneProp":null,
+				"setBlockProps":[],
+				"listBlockProps":[],
+				"nestedListBlockProps":[],
+				"maxItemsOneBlockProp":"04da6b54-80e4-46f7-96ec-b56ff0331ba9"
+			}
+		}
+	}`)
+	})
+}