Spec for collections inside polymorphic objects inside polymorphic objects are not generated correctly

[stijn-o-ispnext]

Describe the bug
I have a polymorphic object that has collection properties (List) that is used inside another polymorphic object. This results in the library generating stuff like:

 "$ref": "#/components/schemas/polymorphicClass/anyOf/0/properties/polymorphicClassThatIsAProperty/anyOf/8/properties/intList"

Instead of

"type": [
  "null",
  "array"
],
"items": {
  "type": "number",
  "format": "int32"
}

OpenApi File To Reproduce
I cannot share the file. Simply create this structure:

[JsonPolymorphic(TypeDiscriminatorPropertyName = "type")]
[JsonDerivedType(typeof(B), typeDiscriminator: "test")]
public abstract class A
{
    public C TestProperty { get; set; }
}

public class B : A
{
}

[JsonPolymorphic(TypeDiscriminatorPropertyName = "otherType")]
[JsonDerivedType(typeof(D), typeDiscriminator: "test1")]
public abstract class C
{
}

public class D : C
{
    public List<int> TestInts { get; set; }
}

Expected behavior
Correct array spec should be generated

[baywet]

This issue sounds like it originates in the ASP.NET core implementation of OpenAPI (Microsoft.AspNetCore.OpenApi). Please reach out on the aspnet repository instead.

Alternatively, if you're using Swashbuckle in your application, you may reach out on the swashbuckle repository.