[XamlC] Collection was modified; enumeration operation may not execute.

[drasticactions]

Description

If you have <?xaml-comp compile="true" ?> enabled in your ResourceDictionary, it will fail to compile with a enumeration error.

https://github.com/davidortinau/ControlGallery/blob/main/src/ControlGallery/Resources/Styles/DefaultStyles.xaml#L1-L6

Steps to Reproduce

Add a resourcedictonary file and set XamlC to compile.

Link to public reproduction project repository

https://github.com/davidortinau/ControlGallery

Version with bug

8.0.0-rc.1.9171

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android, Windows, macOS

Affected platform versions

No response

Did you find any workaround?

Disable XamlC

Relevant log output

Resources\Styles\Text.xaml : XamlC error : Collection was modified; enumeration operation may not execute. [X:\Code\Wor
k\ControlGallery\src\ControlGallery\ControlGallery.csproj::TargetFramework=net8.0-maccatalyst]
Resources\Styles\Text.xaml : XamlC error : Collection was modified; enumeration operation may not execute. [X:\Code\Wor
k\ControlGallery\src\ControlGallery\ControlGallery.csproj::TargetFramework=net8.0-ios]
Resources\Styles\Text.xaml : XamlC error : Collection was modified; enumeration operation may not execute. [X:\Code\Wor
k\ControlGallery\src\ControlGallery\ControlGallery.csproj::TargetFramework=net8.0-android]

[jfversluis]

Same/related to #17461 ? Where something similar is also mentioned

[StephaneDelcroix]

Same/related to #17461 ? Where something similar is also mentioned

no, but I think I already fixed that

[StephaneDelcroix]

dupe of #17333, fixed by #17364