I'm getting  SAM ammo dropping on an "undo".
The undo is not clearing all the items.. maybe because the ammo is dropping out, becasue the sam site is despawned  before the ammo?
Possibly due to the build order ?

i could attach a picture, but i'm sure you know what sam ammo looks like....

Interstingly after an hour of testing , it  also rarely does it with  other loot items as well, building shape seems to matter !! (more likely on a building with a lot of triangles)

Finally it seems the separate plugin "removerTool"   & "/remove all"  sucessfully removes all parts of the building & loot reliably every time

Merged post

Can you spawn batteries with a full charge as well?