Volatile cores overtuned/bugged

The volatile cores that release from rare enemies on death, or the map modifier needs looking into. First off, theyre a one shot on high tier maps, but A, they have unlimited range, they will chase you over the entire map at any speed you have. Secondly they do not despawn ever. I died to one, came back into the map to have an army of them there waiting ready to chase me down.
They need a tether range or a time limit. (Or both) I think this is the biggest issue with them.
Respawning into a map to have them waiting for you is very BS to put it politely.
And yes I know they stop moving only when theyre over you and you stop. Try doing that when surrounded by hundreds of mobs. (or if you get body blocked it game over)