Regression: incorrect nullability annotations in Xamarin.AndroidX.AppCompat 1.8.0 #1558

Android framework version

net10.0-android

Affected platform version

.NET 10.0.400

Description

Xamarin.AndroidX.AppCompat used to have correct C# nullability annotations in version 1.7.1.4, but they're gone in version 1.8.0, resulting in numerous build warnings.

This is not an isolated incident; A similar regression exists for the latest version of AndroidX.Fragment.App (e.g. in Fragment.GetString). My guess is the nullable annotations are not being properly bound from Java.

Steps to Reproduce

1. Create a project:

dotnet new androidlib
dotnet package add 'Xamarin.AndroidX.AppCompat@1.8.0'

2. Add the following code:

public class Class1
{
    public void X()
    {
        AndroidX.AppCompat.App.AlertDialog dialog = new AndroidX.AppCompat.App.AlertDialog.Builder(null!).Create();
        //  Code is valid because the return value of Create() is non-null
    }
}

3. dotnet build and observe the build warnings:

Class1.cs(9,53): warning CS8600: Converting null literal or possible null value to non-nullable type.

5. Downgrade to 1.7.1.4 and observe the warnings are gone

Did you find any workaround?

No response

Relevant log output