Laurmac - https://developer.apple.com/forums/profile/Laurmac nailed it in this post:
https://developer.apple.com/forums/thread/652842?answerId=658366022#658366022
... hold down the option key while clicking Messages in the Dock. It seems to me to be related to the Messages window trying to come up but the coordinates are off and the app is offscreen, but the app is depending on isVisible in order to complete the process of launching. That would do exactly what we are seeing.
This was a recommended fix from Apple... my guess is that all the workarounds we're finding are enough to reset the x/y coordinates of the window so that it comes up onscreen and visible. 🙃
armchairdeity
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