Drops, debris heat interaction with dupes and other fauna

[WhiteWind36]

Recently (3 days ago) I started new colony on frozen forest asteroid.

Don't need to explain that everything there is frozen and even polluted water and brine can freeze to ice in most of the map locations. And I was pretty careful planning liquid locks and using liquids that will not freeze, and everything went well. Until yesterday I loaded a save and had instantly broken liquid lock consisting from drop of brine in temperature surrounding -7, because there was 166g of regular ice and suddenly after loading game dupes going through that liquid lock was melting that ice making drop of brine to move, broking liquid lock and eventually freezing back to ice.

Also I noticed same strange instant heat exchange of grams of ice debris and pips going by, melting it and then it instantly freeze back to ice.

Is this some new mechanic, was there some info about that in update?

Because just few days ago same liquid lock with same ice in it and same dupes going through it wasn't a problem. I even tried loading older saves, but this heat exchange trick happens or more likely starts to work from new load. So that means I was definitely having same setup with no problems and now after many reloads and observation I would say it is a new mechanic.