Hi,
I’ve tested with a clean reboot, just opening visual studio with the solutions and the errors start appearing right away. I have my VS analysis scope set to “Entire Solution” so as soon as I open it I guess the analyzers kick in. Anyway just opening the solution starts producing the errors.
This only happens on version 17.4 so maybe something changed on VS side to make this happen. Looking at the release notes for VS 17.4 the only mention of “extensions” is in the new rollback feature. Maybe something worth looking into?
Also as a side note, my colleague did a repair install in VS 17.4 so everything was installed fresh and the same error occurred.