System.Text.Json source generator ignores properties from base records defined in separate assemblies

[Memoryfox]

Description

Properties of a base record defined in a referenced NuGet package are ignored when creating a JsonSerializerContext.
When working with classes it is working as expected.

Reproduction Steps

Create a project with a record:

public record FooData
{
	public virtual int FooValue { get; set; }
}

Create a NuGet package.

Create a second project and reference the NuGet package:

public record BarData : Foo.FooData
{
	public int BarValue { get; set; }
}

Create a JsonSerializerContext:

[JsonSerializable(typeof(BarData))]
public partial class BarJsonSerializerContext : JsonSerializerContext { }

Expected behavior

The generated context (BarJsonSerializerContext) should handle FooValue and BarValue.

Actual behavior

The generated context (BarJsonSerializerContext) handles only BarValue.

Regression?

No response

Known Workarounds

Reference the project with the base types directly if possible instead of using a NuGet package.

Configuration

.net 6.0.100

Other information

No response

[ghost]

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Issue Details

---

Description

Properties of a base record defined in a referenced NuGet package are ignored when creating a JsonSerializerContext.
When working with classes it is working as expected.

Reproduction Steps

Create a project with a record:

public record FooData
{
	public virtual int FooValue { get; set; }
}

Create a NuGet package.

Create a second project and reference the NuGet package:

public record BarData : Foo.FooData
{
	public int BarValue { get; set; }
}

Create a JsonSerializerContext:

[JsonSerializable(typeof(BarData))]
public partial class BarJsonSerializerContext : JsonSerializerContext { }

Expected behavior

The generated context (BarJsonSerializerContext) should handle FooValue and BarValue.

Actual behavior

The generated context (BarJsonSerializerContext) handles only BarValue.

Regression?

No response

Known Workarounds

Reference the project with the base types directly if possible instead of using a NuGet package.

Configuration

.net 6.0.100

Other information

No response

Author:	Memoryfox
Assignees:	-
Labels:	area-System.Text.Json, untriaged
Milestone:	-

[eiriktsarpalis]

I can reproduce, the issue specifically impacts records inherited across projects. It doesn't seem to impact regular classes. I can reproduce using p2p references, so this is not exclusive to NuGet dependencies. Minimal reproduction:

Class Library

public record LibRecord
{
	public int LibValue { get; set; }
}

Console App

using System;
using System.Text.Json;
using System.Text.Json.Serialization;

var value = new AppRecord { LibValue = 1, AppValue = 2 };
string json = JsonSerializer.Serialize(value, MyJsonSerializerContext.Default.AppRecord);
Console.WriteLine(json);

public record AppRecord : LibRecord
{
	public int AppValue { get; set; }
}

[JsonSerializable(typeof(AppRecord))]
public partial class MyJsonSerializerContext : JsonSerializerContext { }

@layomia @ericstj seems like something to consider for servicing?

[layomia]

Dupe - same underlying issue as #62374.