applying a texture pack just crashes upon generating i think an 8k texture atlas for latex blocks or well thats the last thing it shows. its pretty darn annoying imo

ive booted it without the changed mod and it loads up just fine.

this is not a memory isssue (ive tried it with and without ferritecore)

If you have a high resolution texture pack or a shit ton of mods that add a lot of new block the game will slow down quite a bit on launch.
But there is options to prevent generating a bunch of latex textures for each block in the game, you probably should use that.