Stand I've bad news for the Mod, it looks like you've still got real issues I'm afraid.
I'm finding that exploding objects do not leave their destroyed models (die objects) or decals (decal stay) behind.
I get the feeling the core of the game has been affected.
So this can happen if Mod files are packed to the main PFFs and so a safer way is to add to the base game with a separate PFF or not to alter the core (original) PFF files.
I'd be guessing but I'll say I suspect the order of the objects has shifted somehow, is there a manifest or reference file somewhere?
Real sry because I can't continue with it as it is.
Here's the map I was working on.