As a Windows user, I cannot help you with Mac issues.
Here is a link that may help you if you have the same configuration:
New plugin: “MIDI Guitar Minimal” for Mac / BigSur
Otherwise search for more answers by typing “Mac M1” in the search field, that’s where I found the previous link.
I have no problem with MG in GP, here is the simplest configuration that works perfectly without even needing to open the MG2 plugin
