[regression/8.0.0-rc.1.9171] XAMLC is currently throwing exceptions in RC1 that don't appear to have been throwing in PReview7

[PureWeen]

Description

XAMLC is currently throwing exceptions in RC1 that don't appear to have been throwing in PReview7

/Users/shneuvil/Downloads/AXamlCStyleError/AXamlCStyleError/Resources/Styles/DefaultStyles.xaml: Error: Collection was modified; enumeration operation may not execute. (AXamlCStyleError) XamlC

Steps to Reproduce

Download this sample based off of https://github.com/davidortinau/ControlGallery
AXamlCStyleError.zip

Try to compile it

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

8.0.0-preview.7.8842

Affected platforms

iOS, Android, Windows, macOS

Affected platform versions

No response

Did you find any workaround?

Remove XAMLC attribute from failing files

Relevant log output

No response