Instead of the user map it just uses the map that is first in the list of skirmish maps, and that map happens to have just 2 players, not 4. So I guess it just uses the first two players, which are the human ones, the Petra-bot players 3 and 4 are jmaybe just dropped as there is no slut in the wrong map.
If it helps, I can provide the map files, too?
Thank you very much for your quick answer and of course for your work!
Nope. I'm not sure if I can attach full logs here in public. They include sensitive data like API keys. I can send you both logs in PM if needed.
In -autostart-nonvisual "NonVisualTrigger.js" is loaded additionally as opposed to regular run. I don't think its the culprit, but who knows.