alright, i just tested it again on gleba and it generated ammoniacal solution there as well.
i must have made a mistake while trying to figure out what was causing it.

i didnt understand what was going on so i figured id share it. thanks for explaining it to me.

Given that atomic bomb uses surface conditions to select tiles and you intentionally disabled surface conditions and editor is involved i am going to claim that it is Not a bug.

this only happens on vulcanus specifically, no other surface has such anomalies.
the inconsistency is what makes me ...

steps to reproduce:
select map editor
new scenario
freeplay
default settings

in the editor go to surfaces and generate planets
switch to vulcanus
enable "ignore surface conditions" checkbox
fire an atomic bomb (tested with rocket launcher and rocket turret)

crater is generated with ammoniacal ...