1.16.5 - World loading freezes at 100% Forge Launcher

[Kreepr]

So... I'm using a custom modpack with the forge/overwolf launcher, and whenever I attempt to load into a world (or create a new one), it simply gets to 100% world loading with no way to cancel it.

The modpack has over 100 mods, and I've tried everything but removing them 1 by 1. The world loads without Optifine, but the mod is required for the modpack to have proper zombie textures and for it to run smoothly due to the aforementioned 100+ mods. I've included a link to the latest.log and debug.log, as well as a modlist.

Modlist and Logs

 

Thank you to anyone willing to help.

 

[Kreepr]

Oops, it should be public now.

[Kreepr]

It does work without Optifine, but as I've said above it's kinda needed for the modpack to work without lag and to have the proper textures.