Some effects like hellknigts green ball's trail wont despawn and this makes game unplayable. Also bullets explosion effects etc. wont despawn and it is annoying!! Plz help me Example
Could you please narrow down the list of loaded mods from 22 to the minimum set that exhibits the problem?
Then post link(s) to the exact version(s) of mods. Also let us know the version of GZDoom you are using.
I loaded Doom 2 MAP08 with Project Brutality 2.03.pk3 but I don't see any problem with barons' projectiles.
Summoning bunch of hell knights didn't help reproduce the problem too.
Are you sure that no other files were loaded except Project Brutality's main .pk3?
This is not a problem with GZDoom. Both mods modify gameplay and visuals heavily, so they are not compatible with each other.
There is no way to fix this issue until somebody will update one of the mod (or both) to make them work correctly together.