Yup, I also upgraded to a new Mac Mini last week (including updating the OS and Logic version), and so far the only problem was a single project that crashed on opening -- unless I opened it after already having another project open. No idea why (it complained about Ozone crashing), but once I got it opened and re-saved, it's been fine.
I even upgraded in the middle of a project, and no complaints, really. The faster processor was an absolute lifesaver bouncing stems -- bouncing a project in 10-20 seconds instead of 90+ seconds is a big help. No problems at all with offline bouncing so far. This has been a great upgrade for me.
Logic Pro X 10.4.5
OS X 10.14.5
2018 Mac Mini i7, 16GB RAM
Focusrite Clarett 8pre