Hello.
I also have a 2019 Intel iMac and so far I have had some bugs. I have had crashes mainly when, upon exiting Logic Pro, I say "Yes" to the question about saving the project. Then it freezes. Although the project saves correctly. In my case, if I save manually before, and then upon exiting, I say "no" to the question about saving, then it usually does not crash.
Only once has it crashed while I was working on a project, but it is certainly a nuisance.
I also find that it is extraordinarily slow to load third-party plugins and with some workflows with tracks.
At first I thought it was a conflict with some third-party plugin, but I did a clean installation of the Mac and tried Logic without third-party plugins, except Kontakt, and it still crashed when I clicked "Yes" to the question about saving when closing the program.
I hope they release an update soon to fix all these issues and continue to support those of us with Intel Macs. What frustrates me is that the Logic team is very slow in releasing updates.