diff --git a/src/NSwag.ConsoleCore.Tests/GenerateSampleSpecificationTests.CheckCSharpClientsAsync_projectName=NSwag.Sample.NET70Minimal_targetFramework=net7.0_generatesCode=True.verified.txt b/src/NSwag.ConsoleCore.Tests/GenerateSampleSpecificationTests.CheckCSharpClientsAsync_projectName=NSwag.Sample.NET70Minimal_targetFramework=net7.0_generatesCode=True.verified.txt
index c63467238d..d65ae1b5c9 100644
--- a/src/NSwag.ConsoleCore.Tests/GenerateSampleSpecificationTests.CheckCSharpClientsAsync_projectName=NSwag.Sample.NET70Minimal_targetFramework=net7.0_generatesCode=True.verified.txt
+++ b/src/NSwag.ConsoleCore.Tests/GenerateSampleSpecificationTests.CheckCSharpClientsAsync_projectName=NSwag.Sample.NET70Minimal_targetFramework=net7.0_generatesCode=True.verified.txt
@@ -258,7 +258,9 @@ namespace MyNamespace
                     var disposeResponse_ = true;
                     try
                     {
-                        var headers_ = System.Linq.Enumerable.ToDictionary(response_.Headers, h_ => h_.Key, h_ => h_.Value);
+                        var headers_ = new System.Collections.Generic.Dictionary<string, System.Collections.Generic.IEnumerable<string>>();
+                        foreach (var item_ in response_.Headers)
+                            headers_[item_.Key] = item_.Value;
                         if (response_.Content != null && response_.Content.Headers != null)
                         {
                             foreach (var item_ in response_.Content.Headers)
diff --git a/src/NSwag.Sample.NET70Minimal/GeneratedClientsCs.gen b/src/NSwag.Sample.NET70Minimal/GeneratedClientsCs.gen
index 9cb9f907fc..a3c74e6481 100644
--- a/src/NSwag.Sample.NET70Minimal/GeneratedClientsCs.gen
+++ b/src/NSwag.Sample.NET70Minimal/GeneratedClientsCs.gen
@@ -258,7 +258,9 @@ namespace MyNamespace
                     var disposeResponse_ = true;
                     try
                     {
-                        var headers_ = System.Linq.Enumerable.ToDictionary(response_.Headers, h_ => h_.Key, h_ => h_.Value);
+                        var headers_ = new System.Collections.Generic.Dictionary<string, System.Collections.Generic.IEnumerable<string>>();
+                        foreach (var item_ in response_.Headers)
+                            headers_[item_.Key] = item_.Value;
                         if (response_.Content != null && response_.Content.Headers != null)
                         {
                             foreach (var item_ in response_.Content.Headers)
diff --git a/src/NSwag.Sample.NET70Minimal/nswag.json b/src/NSwag.Sample.NET70Minimal/nswag.json
index cabd9f7830..4d1dd750d0 100644
--- a/src/NSwag.Sample.NET70Minimal/nswag.json
+++ b/src/NSwag.Sample.NET70Minimal/nswag.json
@@ -83,7 +83,9 @@
       "clientBaseClass": null,
       "configurationClass": null,
       "generateClientClasses": true,
+      "suppressClientClassesOutput": false,
       "generateClientInterfaces": false,
+      "suppressClientInterfacesOutput": false,
       "clientBaseInterface": null,
       "injectHttpClient": true,
       "disposeHttpClient": true,