In the current snapshot as well as the previous one Piglins and Hoglins are freezing in the nether in the same manner as they would in the overworld, turning them into Zombie Piglins/Hoglins. As far as I can tell this was not the case in the first snapshot for 1.21.11
The effect persists between worlds and seems to have no necessary requirements.
MC-303523
Piglins and Hoglins are freezing in the nether
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