DialogHost: XamlObjectWriterException - Unresolved reference 'ContentCoverBorder'

[MichelMichels]

Bug explanation

When running a Window with nothing else but a DialogHost, following exception gets thrown:
System.Xaml.XamlObjectWriterException in System.Xaml.dll
Additional text: Unresolved reference 'ContentCoverBorder.

It has something to do with this PR: bfe348f

When I revert this change, the issue goes away but the binding error shows up again.

Version

5.0.0

[MichelMichels]

Additional context:

• StackOverflow thread about x:Reference
• Microsoft docs about x:Reference and WPF

Above sources seem to indicate that the use of x:Reference is discouraged or even prohibited?

[alexachso]

I am experiencing the same issue with my app when I try to debug it.

[Hadramet]

I have attempted to reproduce the issue on a new project but the problem does not occur.