You might want to look at this thread, I have not followed it very closely (am running Catalina on my Mini) but it seems that some people started having issues with Mojave on the 2018 Mini following Security Update 2020-002
forums.macrumors.com
I am using Parallels with virtual Sierra and Mountain Lion machines on my 2018 Mini to run legacy 32-bit software and it works really well. The software I'm using wouldn't work on Mojave anyway. Not sure how well the virtual approach would work with audio software however.
Mac Mini 2018 Kernel panic bug_type 210 after Security Update 2020-002
Hello everyone, since installing the Mojave Security Update 2020-002 I do get a message that my Mac Mini 2018 was restarted because of a problem even I shut it down normally. The Mac Mini 2018 was running fine for 3 months. The Apple Hardware Check does not show any errors. Also tried to reset...
I am using Parallels with virtual Sierra and Mountain Lion machines on my 2018 Mini to run legacy 32-bit software and it works really well. The software I'm using wouldn't work on Mojave anyway. Not sure how well the virtual approach would work with audio software however.