Hi @zequion ,
I am so sorry to hear about the issue you are having.
I checked the Stack Trace you uploaded, it may be a known issue. You can see it:
Document Highlights not working · Issue #70785 · dotnet/roslyn · GitHub
The issue is still under investigation by the product group. You can comment and track it in that GitHub ticket.
If the warning doesn’t affect your project, you can ignore it or click the “X” to temporarily disable it:
Sorry for any inconvenience!
Sincerely,
Anna
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