Hi @Planck, Jeremy ,
Welcome to Microsoft Q&A!
It may be caused by the installed extensions, please temporarily disable or uninstall the installed extensions under Extensions > Manage Extensions > Installed.
Meanwhile, please turn off the anti-virus software on your pc.
Then, close all running VS instances and manually delete the .vs, bin and obj folders in the project folder.
You can run VS2019 as administrator and rebuild the solution.
Sincerely,
Anna
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