How to make sure Perandus chests open?

Been having trouble with this sometimes.

If you don't sprint around the mobs and hang out by the chest and kill them right next to it, sometimes they will all die too far from the chest, and it stays permanently locked.

Is this intended behavior, and not a bug? Assuming it is intended, can anyone advise me of better (safer) methods to make sure the chests open?

Quite sure it is a bug. :V There should be always at least one monster spawning, if chest is still closed.

Maybe u have, what i had few times. The chest doesnt spawn last pack, just go away, kill some stuff and come back after a min or so and a pack of mobs will be there. After they r dead, chest opens.

I don't understand why they don't work like strongboxes

with strongboxes, no matter how far the enemy is, if it dies, it counts

maybe it's a technical issue because it needs to resurrect enemies which would not be possible with strongboxes...

either way it sucks

Could a mod please move this to Bug Reports? Thanks!