System.Text.Json Serialize ignores Properties from base interfaces

[jogibear9988]

Description

If you have a Interface wich inherits from a Basic one, System.Text.Json only serializes the Properties from the Interface specified.
This has nothing to do with polymorphism, cause I've got a instance of the derived interface.
(Look, my Object Variable is of Type B, and Type B should include the Properties of Type A)

Reproduction Steps

Try this Code:

    interface A
    {
        string NameA { get; }
    }

    interface B : A
    {
        string NameB { get; }
    }

    public class C : B
    {
        public string NameA => "A";
        public string NameB => "B";
    }

    [Test]
    public void TestSystemTextJson()
    {
        B obj = new C();
        var text = System.Text.Json.JsonSerializer.Serialize(obj);
    }

Expected behavior

The result should be:

    {"NameA":"A","NameB":"B"}

Actual behavior

The result is:

{"NameB":"B"}

Regression?

No response

Known Workarounds

No response

Configuration

.Net6 latest Service Pack
Windows 10
x64

Other information

No response

[ghost]

Tagging subscribers to this area: @dotnet/area-system-text-json, @gregsdennis
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

If you have a Interface wich inherits from a Basic one, System.Text.Json only serializes the Properties from the Interface specified.
This has nothing to do with polymorphism, cause I've got a instance of the derived interface.

Reproduction Steps

Try this Code:

    interface A
    {
        string NameA { get; }
    }

    interface B : A
    {
        string NameB { get; }
    }

    public class C : B
    {
        public string NameA => "A";
        public string NameB => "B";
    }

    [Test]
    public void TestSystemTextJson()
    {
        B obj = new C();
        var text = System.Text.Json.JsonSerializer.Serialize(obj);
    }

Expected behavior

The result should be:

    {"NameA":"A","NameB":"B"}

Actual behavior

The result is:

{"NameB":"B"}

Regression?

No response

Known Workarounds

No response

Configuration

.Net6 latest Service Pack
Windows 10
x64

Other information

No response

Author:	jogibear9988
Assignees:	-
Labels:	area-System.Text.Json
Milestone:	-

[eiriktsarpalis]

Thanks for reporting. I believe this is a duplicate of #41749.