Logic Pro Internal Dolby Atmos Plug-In still not available

Hello again,

I have still a strange phenomenon here:
When I load one of the two spatial demo songs, Logic Pro 10.8.1 on my new Mac Studio comes up with an error message:



"The plug-in "Atmos" - type "10 - 12" is not available on your system.
Choose a different plugin or exit Logic
Pro and install the plugin on your Mac Studio so you can use it in the project."

The plugin will then appear with the famous yellow exclamation mark in the master's plugin slot.
I can then use the Dolby Atmos plug-in again, but it doesn't work correctly, i.e. it doesn't do any upmixes and the signals that are output are heavily disturbed and sometimes routed incorrectly

When testing with your own Dolby Atmos project, the Dolby Atmos plug-in appears as expected, but also makes the same errors, i.e. no rendering possible.

My attempts to get rid of it:

Switching to Rosetta Mode and back
Reinstall Logic Pro 10.8.1 via App Store
Starting an old Logic version (10.7.2) on the same computer
Start without 3rd party plug-ins
Deleting Logic10.plist in Preferences
Reinstalling the Music Apps folder in "Music"
Restart the computer
Trashing Plugin/Logic Prefs and re-scan/restore default settings in PI Manager

System: Mac Studio M2 Ultra 128GB, Ventura 13.6.8


I have no idea what else I could do. Does anyone know where the internal plug-ins are located?

Then I could possibly copy the plugin from my Macbook - it runs Dolby Atmos without any problems, i.e. I can play the projects in Dolby Atmos and upmix them to 7.1.4...

I'm grateful for every idea!

Greetings

Mike