Plasmastone pipe bombs don't work

[Anticheese]

After hollowing out a pipe frame, I found that trying to bung a piece of plasmastone in (as far as I recall, weldfuel, gunpowder, plasmastone, and erebite were all valid in order of power as pipe bomb fillings) didn't work. Creating a welding fuel bomb still worked, but I haven't been able to test it with the other two ingredients yet.