so much layer tnt this is the answer (if you layer more than 5 particles it will create a bhol, some times it don't happen)
That's... weird? Did it make BHOL because of the non-existing compressed space that was were the bomb was?
go into it, right click a blank spot, click CTRL Z and then unpause, it may (somewhat unlikly) make a bigger and more plasmatic explosion, and I know Plasmatic doesn't mean heaps of plasma but I can't think of a better word.
I set gravity to radial, placed heaps of THDR (or whatever) and let it merge into a couple of pixels, changed it to Tnt with console command !set type thdr tnt and then unpaused, then i saw it left something and... ! Blackhole!