The undead should be immune to cold damage.

The undead should be immune to cold damage.
After all, the undead, as the name says, are already dead so they can't drown or run out of oxygen and they don't need to eat.
It seems to me that they should not be frozen either, after all meat is better preserved in cold places, so I think that the cooling effect of powder snow should be useless against them since they are immune (maybe even adding that skeletons like the underwater zombies that in several minutes become drowned, the skeletons under the powder snow should turn into stray)
Also speaking of what immunity to cooldown is, snow golems and Vex should be immune to this damage (since one is a ghost that goes through blocks and the other is made of snow)
And others like polar bears, goats, sheep, wolves, and arctic foxes should be able to get out of the powdery snow as well (since they have a lot of wool and leather on their body and should take longer to freeze).
Please developers, if you are reading this, you know it is true and it is a very good idea.