[Bug] VisualStateManager with RadioButton stops responding over time

Description

When using a VisualStateManager to style radio buttons with IsChecked bound, they work at first, but then stop responding to bound value changes.

Steps to Reproduce

Minimal example at CZEMacLeod/RadioButtonIssue Run the example. At first each channel radio button highlights in turn as the model is updated. After some time (30s or more) the buttons slowly stop highlighting when the model changes. They still 'check' in response to UI interaction.

Expected Behavior

The radio buttons continually update their visual state.

Actual Behavior

Over time, the radio buttons stop updating their visual state in response to the bound model.

Basic Information

Version with issue: Xamarin.Forms 5.0.0.2012
Last known good version: Unknown
Platform Target Frameworks:
- Android: 11.0 (R)
NuGet Packages:
- Xamarin.CommunityToolkit 1.1.1
- Xamarin.Essentials 1.6.1
- Xamarin.Forms 5.0.0.2012
Affected Devices:
- Android Emulator 9.0 - API 28
- Samsung Galaxy S10+ - Android 11 - Api 30
  Environment
  
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Build Logs

Screenshots

Channel 2 working correctly Screenshot_1617895747

Channel 8 working correctly Screenshot_1617895764

Channel 8 failing after some time Screenshot_1617895788

Channel 8 clicked in row 1 (responds to UI interaction, but bound value in row 2 fails to update) Screenshot_1617895793

Reproduction Link

CZEMacLeod/RadioButtonIssue

Workaround

None

Debug output

Thread started: <Thread Pool> #10
Thread started: <Thread Pool> #11
Thread started: <Thread Pool> #12
Thread started: <Thread Pool> #13
Thread started: <Thread Pool> #14
Thread started: <Thread Pool> #15
...
[Mono] DllImport searching in: '__Internal' ('(null)').
[Mono] Searching for 'java_interop_jnienv_call_float_method_a'.
[Mono] Probing 'java_interop_jnienv_call_float_method_a'.
[Mono] Found as 'java_interop_jnienv_call_float_method_a'.
[adiobuttonissu] Explicit concurrent copying GC freed 2560(182KB) AllocSpace objects, 0(0B) LOS objects, 49% free, 1578KB/3MB, paused 330us total 5.419ms
[Mono] GC_TAR_BRIDGE bridges 163 objects 335 opaque 91 colors 163 colors-bridged 163 colors-visible 163 xref 0 cache-hit 0 cache-semihit 0 cache-miss 0 setup 0.02ms tarjan 0.08ms scc-setup 0.03ms gather-xref 0.01ms xref-setup 0.01ms cleanup 0.21ms
[Mono] GC_BRIDGE: Complete, was running for 7.33ms
[Mono] GC_MINOR: (Nursery full) time 3.41ms, stw 4.28ms promoted 1036K major size: 1968K in use: 1236K los size: 2048K in use: 1726K

I thought at first the adiobuttonissu and Mono GC were related, but having run it a few times, I think it stops working correctly before they appear. There is approximately 40 seconds of nothing in the output where ... appears above.

I have also tried without the RadioButtonGroup.SelectedValue="{Binding Channel}" but it still fails the same way. I also tried implementing my own equality converter in case there was something there, but I have traced that and tried with the XCT version but it doesn't seem to make a difference. I also tried it with directly bound properties without a converter with the same result. Notably it appears to affect the last item in the grid row first, and seems to be exacerbated by UI interactions.

xamarin / Xamarin.Forms