Ice melts well below freezing temperatures

[Marquesas]

also, it's pretty obvious that ice is not treated as cool water that becomes a solid but as a separate entity that has a timer after which it just goes poof

I think ice as an object on the tile is not the same as ice as a reagent that's all

Nice work Sherlock, A+.

Also, I'd say no, don't even consider this. With a hole to space an entire corridor could be permanently iced up which is basically just dumb.