Migration Assistant hang-up MacPro 5.1 (Mid 2012)

I have used the OpenLegacyCorePatcher to install Sonoma on a new SSD, while the old 10.13 user accounts reside on a separate HDD (MacPro 5.1, Mid 2012, not modified). 20 GB RAM, 500GB SSD, 1TB HDD. Everything went really smooth, but ...

... I selected to import my old user profile during setup. It imported Apps and Folders fine, but not the profile.

When I now start the Migration Assistant under Sonoma, it

  1. asks me for an Admin account password;
  2. starts MA, shows MA's first window, lets me select "continue";
  3. Screen changes from my account to a new screen (dice roller effect), MA window shows correctly the HDD, "looking for other sources" is spooling;
  4. ! during this, suddenly, the screen switched back to the log-in screen, no change back possible, there is a "Startup User" shown as well, but not able to log-in there;
  5. if I log in with the admin account, the MA window is shown again, but freezed.

Does anyone have an idea how to solve this? Is there a safe way to start MA through the OLPatcher or during start-up? Thanks!

submitted by /u/UveliusSang
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