in vanilla minecraft if fog clouds are turned on
become translucent

what looks not like fog but like smoke
and frankly a bit ugly

and partly a bug
which was just scored

there are already resource packs and mods to fix this problem for version 1 18 2 and higher

however they don't work for obvious reasons on 1 12 2

I would like to see a backport of the fog fix resource pack from vanilla tweaks
since it doesn't work on 1 12 2

off vanilla

Fixed

This resouce pack
VanillaTweaks_r856731.zip