Mechanized airlocks no longer show the transmitting of heat. Other airlocks and pneumatic doors do fine. If you open and close the door the temperature will start to even out but will jump between seemingly odd variations of its previous average temperatures. Temperature change does occur normally so it has to do with the tooltip updating, and possibly the objects link with the material underlying it. Like when you put a door down it makes a hidden tile of "iron" or whatever material you are using behind what the player can see, that hidden object is what interacts with the temperature change and the tooltip of the object updates accordingly. However when you deconstruct the object the materials generated are based on the objects tooltip information so besides the tooltip not updating the wrong temperature material is refunded, which is less of a bug but still.
I noticed this when my cooling loop broke on my sleet farm (this ended up being due to built up heat in other areas where tempshift plate wasn't working so when it was fixed it just so happened to mess up my loop making me think the doors were not shifting temperatures). So I turned debug mode on and built a door in the magma, many cycles later no temperature change.