ContentPresenter just rendering component string in .Net9

[DrJShoff]

Description

Im using ContentPresenter to redifine RadioButton appearance. This has stopped working on Android after upgrading to .Net9.

Steps to Reproduce

1. Create new MAUI project.
2. Follow this example to reproduce: https://learn.microsoft.com/en-us/dotnet/maui/user-interface/controls/radiobutton?view=net-maui-9.0#redefine-radiobutton-appearance

Expected behavior is to get the components rendered correctly

Link to public reproduction project repository

No response

Version with bug

9.0.10 SR1

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

No response

Did you find any workaround?

It renders correctly if targeting .Net8

Relevant log output

[ninachen03]

I can repro this issue at Android platform on the latest 17.13.0 Preview 1.0(9.0.10 &9.0.0), but it worked for (8.0.100). It's a regression from .NET 8 to .NET 9.

[jsuarezruiz]

I can repro this issue at Android platform on the latest 17.13.0 Preview 1.0(9.0.10 &9.0.0), but it worked for (8.0.100). It's a regression from .NET 8 to .NET 9.

Happens using the Content property, ControlTemplate property or both?

[jsuarezruiz]

I can repro this issue at Android platform on the latest 17.13.0 Preview 1.0(9.0.10 &9.0.0), but it worked for (8.0.100). It's a regression from .NET 8 to .NET 9.

Happens using the Content property, ControlTemplate property or both?

Already tested, happens using ContentPresenter.

[jsuarezruiz]

Found the cause of the problem. The binding from ContentPresenter changed here 4c3a09c#diff-f01d408e1d2b3cd4a4c1bcf731586c215c9d57d4585d6815d5c89118a1ef3f44R20 (changes to allow trimming).