Ich habe das Tausende von Malen auf Dutzenden von Geräten mit allen Android-Version (2 -13) seit mehr als 10 Jahren gemacht. Es gab damit nie Probleme.
Mache ein Video von deiner Prozedur und lass uns an deinem "Mysterium" teilhaben.
I've done this thousands of times on dozens of devices with all Android versions (2 -13) for more than 10 years. There were never any problems with that.
Make a video of your procedure and let us see your mystery.
I should have noticed that on one of my (currently used) 19 test devices (Android 4 - 13). And how should it be possible that the assets are back after "Storage & Cache" has been deleted?
After a (complete) uninstallation of the companion app, there should be NO more directories: Computer\Pixel 4 XL\Internal shared storage\Android\data\edu.mit.appinventor.aicompanion3
Apparently I was able to solve the problem. A Pac-Man game from back in the day caused this. Somehow my folder got cluttered with files that don't belong there.
I exported and deleted the aia. Then re-imported from the computer. Now the assets folder only contains the files that are really needed.
No idea how something like that could happen. I think I can remember once accidentally copying a folder with lots of files into the media folder of the game.
However, I deleted them all by hand. Something must have gone wrong.