Snazzy suits under atmosuits melt on magma

So My duplicant took a magmaswim to prepare a volcanic oil boiler. He left behind a 4000gram tile of refined carbon and reported "toasty surroundings" but took no health dmg.

I guess the snazzy suits arent worn over the atmosuits, so in theory they should not melt unless the duplicant is also melting.

Another thing is, a duplicant without insulation takes health damage in an 80 celsius sauna, but goes out without a scratch from molten magma in an atmosuit. Maybe magma + atmosuit should also trigger scalding, while not carbonating the underwear.