Used containment but mobs remained and maybe in multiple amount

Idk how to replicate it or what i've done specially
Long story short - it was so so many mobs on my map with containment scarab. And it was critical bc it gave me around x4-5 of avg loot
here's video of loot with all boxes not being opened and i also shown my map mods https://youtu.be/7ghtvHJU5AM
also scarabs that i used: x2 ambush, x1 containment, x1 nemesis, x1 hidden compartments

It's one of the new nodes on the atlas tree is the general consensus right now where a specific special mob spawns and bricks how Containment works. Has already been reported dozens of times since that new passive was introduced, no fix yet.