Minor Possible bug with toxins mixing

[MrMagolor]

If you're pumping o2 and plasma together into the heat exchanger it will burn in the pipe and can rupture releasing co2 that kills your flame

It's hard to say exactly what might be going on from the description though.

That said it was working for me just fine yesterday

The can didn't rupture though, it just lost pressure and temperature very quickly.

I suspect this might have something to do with that re-pressurization update: which makes sense, opening the PURGE VENT for a burn should shut it down pretty quickly.