Hi @eddy ,
Welcome to Microsoft Q&A!
What is your Visual Studio? Is it a migrated project?
You can right-click on your project to unload project and check if the <ProjectTypeGuids>
tag exists in your .csproj file or not.
You can refer to the similar issue: https://stackoverflow.com/questions/7377286/project-guid-keeps-changing.
Sincerely,
Anna
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