The removal of big asteroids I am ABSOLUTELY positive I found the source which is a combination of 3 factors
-This mod and it's updated auto correcting of path asteroids.
-Muluna removing medium, big and huge asteroids around the planet that the moon orbits (to make starts easier)
-AND me starting on aquilo
It resulted in the moon spawning around aquilo, removing the big and medium asteroids around aquilo and itself AND THEN this mod triggering, looking at the connection between aquilo and rubia and noticed that aquilo has only small asteroids while rubia has medium and small, so it doesn't add big asteroids in between the two planets, leading to the game being MUCH easier as I don't have to worry about big asteroids between these two.
This wasn't a problem before as the asteroids on the paths weren't automatically checked like this.
The only fix for that would be like making the system that adds asteroids on paths work before the muluna removing big asteroids, but that is not something I'm gonna ask from you as it is a very niche problem.
Only happening with a player who does a non nauvis start. I imagine that if someone starts on vulcanus the path between nauvis and vulcanus would also be clear of medium asteroids as neither would have medium asteroids in their orbit.
Yeah I thought about this topic a bit while I was on a small holiday so here is my theory.