xelotex

> what modloader? Forge

> Just to confirm, the issue isn't present with just optifine and forge? it isn't

what do you mean with "if the rendering engine is capable of such a feature"? do you mean that it could cause lag? ¿or that the minecraft engine can't do...

yEAH tHis stiLl HaPpens

lol, you can just use the mod "Bad Mobs" https://www.curseforge.com/minecraft/mc-mods/bad-mobs

i guess this will do: https://www.curseforge.com/minecraft/mc-mods/mobifier

zombie awareness and dynamic stealth are compatible, you just need to go in the config file of zombie awareness and set "SightRange" to 0.