diff --git a/package.json b/package.json
index 66ffc5465..4598454e9 100644
--- a/package.json
+++ b/package.json
@@ -65,6 +65,7 @@
     "@types/jest": "^29.5.12",
     "@types/node": "^20.12.7",
     "@types/normalize-path": "^3.0.2",
+    "@types/ts-expose-internals": "npm:ts-expose-internals@^5.4.5",
     "ajv": "^8.12.0",
     "ajv-formats": "^3.0.1",
     "auto": "^11.1.6",
diff --git a/src/NodeParser/FunctionNodeParser.ts b/src/NodeParser/FunctionNodeParser.ts
index d75003824..1426c44fb 100644
--- a/src/NodeParser/FunctionNodeParser.ts
+++ b/src/NodeParser/FunctionNodeParser.ts
@@ -16,12 +16,7 @@ export class FunctionNodeParser implements SubNodeParser {
     ) {}
 
     public supportsNode(node: ts.TypeNode): boolean {
-        return (
-            node.kind === ts.SyntaxKind.FunctionType ||
-            node.kind === ts.SyntaxKind.FunctionExpression ||
-            node.kind === ts.SyntaxKind.ArrowFunction ||
-            node.kind === ts.SyntaxKind.FunctionDeclaration
-        );
+        return node.kind === ts.SyntaxKind.FunctionType;
     }
 
     public createType(
diff --git a/src/NodeParser/PromiseNodeParser.ts b/src/NodeParser/PromiseNodeParser.ts
index 2259730a9..016c9811c 100644
--- a/src/NodeParser/PromiseNodeParser.ts
+++ b/src/NodeParser/PromiseNodeParser.ts
@@ -1,5 +1,5 @@
 import ts from "typescript";
-import type { Context, NodeParser } from "../NodeParser.js";
+import { Context, NodeParser } from "../NodeParser.js";
 import type { SubNodeParser } from "../SubNodeParser.js";
 import { AliasType } from "../Type/AliasType.js";
 import type { BaseType } from "../Type/BaseType.js";
@@ -31,13 +31,24 @@ export class PromiseNodeParser implements SubNodeParser {
 
         const type = this.typeChecker.getTypeAtLocation(node);
 
-        // @ts-expect-error - Internal API of TypeScript
         const awaitedType = this.typeChecker.getAwaitedType(type);
 
+        // ignores non awaitable types
+        if (!awaitedType) {
+            return false;
+        }
+
         // If the awaited type differs from the original type, the type extends promise
         // Awaited<Promise<T>> -> T (Promise<T> !== T)
         // Awaited<Y> -> Y (Y === Y)
-        return awaitedType !== type && !this.typeChecker.isTypeAssignableTo(type, awaitedType);
+        if (awaitedType === type) {
+            return false;
+        }
+
+        // In types like: A<T> = T, type C = A<1>, C has the same type as A<1> and 1,
+        // the awaitedType is NOT the same reference as the type, so a assignability
+        // check is needed
+        return !this.typeChecker.isTypeAssignableTo(type, awaitedType);
     }
 
     public createType(
@@ -45,11 +56,8 @@ export class PromiseNodeParser implements SubNodeParser {
         context: Context,
     ): BaseType {
         const type = this.typeChecker.getTypeAtLocation(node);
-
-        // @ts-expect-error - Internal API of TypeScript
-        const awaitedType = this.typeChecker.getAwaitedType(type);
-
-        const awaitedNode = this.typeChecker.typeToTypeNode(awaitedType, undefined, ts.NodeBuilderFlags.NoTruncation);
+        const awaitedType = this.typeChecker.getAwaitedType(type)!; // supportsNode ensures this
+        const awaitedNode = this.typeChecker.typeToTypeNode(awaitedType, undefined, ts.NodeBuilderFlags.IgnoreErrors);
 
         if (!awaitedNode) {
             throw new Error(
@@ -57,7 +65,7 @@ export class PromiseNodeParser implements SubNodeParser {
             );
         }
 
-        const baseNode = this.childNodeParser.createType(awaitedNode, context);
+        const baseNode = this.childNodeParser.createType(awaitedNode, new Context(node));
 
         const name = this.getNodeName(node);
 
diff --git a/yarn.lock b/yarn.lock
index 5cb315869..3445f2337 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1971,6 +1971,11 @@
   resolved "https://registry.yarnpkg.com/@types/stack-utils/-/stack-utils-2.0.3.tgz#6209321eb2c1712a7e7466422b8cb1fc0d9dd5d8"
   integrity sha512-9aEbYZ3TbYMznPdcdr3SmIrLXwC/AKZXQeCf9Pgao5CKb8CyHuEX5jzWPTkvregvhRJHcpRO6BFoGW9ycaOkYw==
 
+"@types/ts-expose-internals@npm:ts-expose-internals@^5.4.5":
+  version "5.4.5"
+  resolved "https://registry.yarnpkg.com/ts-expose-internals/-/ts-expose-internals-5.4.5.tgz#94da2b665627135ad1281d98af3ccb08cb4c1950"
+  integrity sha512-0HfRwjgSIOyuDlHzkFedMWU4aHWq9pu4MUKHgH75U+L76wCAtK5WB0rc/dAIhulMRcPUlcKONeiiR5Sxy/7XcA==
+
 "@types/yargs-parser@*":
   version "21.0.3"
   resolved "https://registry.yarnpkg.com/@types/yargs-parser/-/yargs-parser-21.0.3.tgz#815e30b786d2e8f0dcd85fd5bcf5e1a04d008f15"