Ambush Scarab of Containment Invasive Adversaries bug

So I have searched around looking for an open thread reporting this bug and wasn't able to find one. There are two other threads I could find, but both were closed without any resolution seemingly.

The issue is that when using the aforementioned scarab, occasionally (now my 3rd map in last 10), the map is absolutely packed to the brim with the packs of difficult and rewarding monsters. So much so in fact that my game lags worse than I'v ever seen it! The way I understood it was that the scarab prevented normal mob spawns and that's the way it normally works, but what happens here is anything but normal. I cant complain about the shear amount of loot, but this does not seem intentional. If it happens again I'm just gonna have to unspec the atlas node, as its just causing waaay too much lag!