I don't know if the problem is linked to some plugins or effects.
I discovered the problem immediately after having upgraded to Monterey.
I use to make films (in HD) varying from 2 or 3 minutes to 20-30 minutes.
I publish all the films I make in 3 languages. The videos are edited from more than 90 % stills (with animation through among others Ken Burns effects and distortion to make them look mor life. All films have music and spoken comment added.
The comments are in 3 languages, and I use Audio and Video roles for this. All but some titles and spoken comments are the same in the 3 versions.
When a film is ready, I first select all role in French. I publish the film. Then I do the same with English and Dutch.
What happened in the begin: the first published video is OK.
The others are failing.
I don't know if ist is still the same (I don't try it anymore as long I don't see a new version appearing, it is too frustrating).
Again, the 3 versions are exactly the same, except that other roles are activated.