Delirium and corruption lagging and attacking before they are fully spawned

Idk if anyone else is having this issue, but delirium and corruption mobs will spawn under my feet and stun lock me before they have even shown on my screen. It's also really laggy when mobs spawn in. Often times the chain of events goes... Running normally, lag spike, stun locked from invisible mob under feet, coinflip if I die or can roll away.

Just feels really unfair and bad to play.