Arbitration Bug - Enemies Invulnerable to abilities even outside the range of Arbies' Drones

[DragoonStorm1]

Basically what the title says: 
Played 55 mins arbies surv today with a clanmate. (We were both Wukong P)
Both of us noticed (I was host) that our Iron Staff refuses to deal any damage (not even 0's) to some enemies sometimes.

They do not have the red drone protection aura around them
They don't have any drone in range, but sometimes there may be one far enough to indicate that they have left a drone's field of effect
They do not show invulnerability in HP bars, and are vulnerable to weapon attacks.

They are immune only to abilities/skills.


This lasted the whole mission. Lua Survival, by the way, so this bug could be related to leaving nullifiers' field of effects too, because I first noticed it on a nullifier unit who was stripped of his bubble. But I later noticed it across various enemy types, and my friend pointed it out to me too. So my best guess is something to do with the arbitration drones.

Thank you for looking into this 🙂