@MojangSupport My hardcore modded world started to glitch and it's making mobs act laggy and they're kinda delayed. I can't take fall damage etc.

Mods can typically cause unexpected behavior, we suggest disabling mods to see if that solves the issue and if so, that's probably the cause. Let us know if you continue to have issues with Vanilla and we can try and assist! ^AM

This is my Minecraft world, I tried everything. I took out the mods, tried it without forge launcher attempted forge launcher again and it still acted like this. (Make sure your volume is low)

Let's have our Tech team take it from here. To keep your information secure, please complete our request form at aka.ms/Minecraft-Support so we can quickly and safely assist with your question! ^BT

It managed to be fixed somehow, it has to do something with the frames or chunks loaded. I put them lower to 10 and it worked, also reinstalled Optifine. Thanks!