When using Snow Pig 2.4.1 on 1.16.5, the game crashes with the following log:

crash-2021-12-28_19.35.04-fml.txt

This issue is not happening on older versions of this mod

You're using forge 36.2.4. This SnowPig version only works for forge versions above 36.2.17 tho.
Forgot to state that in the changelog for this update, my bad!