Strongboxes with certain mods don't spawn any mobs or spawn very few.

I've envountered this problem today when chaining maps.

A few of strongboxes I've encountered (most work fine) failed to summon any mobs at all, or summoned only a small hanfull (way less than normally spawn from any box).

Instead of fightnig mobs I just got a second-or two of lag, and then I simply got the items from that box without a fight.

I cannot exacly pinpoint what mod is to blame, but I think it usually happened with the boxes that had "spawn extra magic/rare monsters" mod on them.

Last time I got this. This box also had lightning storm, which actually activated. Still no mobs tho.

Today I also had a strongbox (white) guarded by 3 packs of monsters but it only spawned (literally) 2 white mobs. Very weird. Sadly I did not make a /bug because I thought it was intended (just like some boxes drop no items or boxes with 1800iir drop only whites).