K C
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I believe this issue is caused by the new addition of the “Environmental Attributes” in this snapshot. The patch notes show that there is a “piglins_zombify” attribute which is set to true by default. My guess is that the developers forgot to set this value to false in the Nether.
Patch notes: https://www.minecraft.net/en-us/article/minecraft-snapshot-25w42a
Mojang, please take notes!