WPF could not compile if Namespace contains Some part of a Nuget or Xml Namespace
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Description
Don't know what the exactly Bug is.
Look at my Code sample:
[XamlDesigner.zip](https://github.com/dotnet/wpf/files/6272960/XamlDesigner.zip)
It contains a Converter in following namespace:
ICSharpCode.XamlDesigner.AvalonDock
If I compile I got this error:

If I change the Namespace to "ICSharpCode.XamlDesigner.aaaAvalonDock" it works. But this Namespace is not contained in the Avalondock Nuget.
This worked in Netcore 3
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