[Becomes immune to damage] All Rare monster in Abyssal Depth

Good day.
Today, when we first entered the depths of the abyss, we encountered a problem that all rare monsters did not receive damage. At some point, for 1-2 seconds, they hung up and could receive damage, but then again received immunity to damage for 10-20 seconds.
Here is a link to a video demonstration of the bug -
https://cdn.steamusercontent.com/ugc/17998524108229032804/D37C97FF1A81B02D654FAED1BC8DF5351BE1FDA8/
https://cdn.steamusercontent.com/ugc/16150181027276144437/85585CAE56A8B01768B19E64B8EFCA5C30B2FFDE/

For the second one i don't think it's a bug, you need to stand in the big fog to deal damage

As you can see from the video, sometimes damage would occur even when we weren't standing in the fog.
(You may also notice that they are constantly being drained of essence, but the energy shield still starts to recover and damage stops occurring)
I also attached a video of a fight with only 2 mobs, but if necessary I can attach 4-5 more videos of fights with other rare mobs, they had the same problem.
The only thing we could notice was that if we were standing close and not moving, they become vulnerable to damage more often than if we were standing far from each other.
P.S. He ended up killing us :C

Still reproducible. (0.3.0b)
We have a better understanding of how to reproduce this:
1. Play in a group.
2. Meet the "snake" enemy, with a tail.
3. When this enemy sees 2 players and wants to start his circular attack with his tail - he bugged.

He can't determine which player to run to and starts running back and forth, and at this time he becomes invulnerable.
And until all the players in the group stand at 1 point and he starts the animation of the circular attack, he will be invulnerable (and all spells and effects of rare enemies continue to hit players).
If one of the players in the group has minions, the bug is reproduced even more often.

Just had this happen as well. Was in the fog no inv affex just stopped taking damage and couldn't kill them anymore.

This needs to be fixed immediately.

I have the same problem, this is ridiculous, so annoying. It takes longer to kill a rare monster than it does to defeat a high level unique boss

+1 , same issue.

Currently having this problem so it's still a thing.

Normally its the snakes, and i try to burst em when they can take dmg, but now its with 2 of the tentacle fire casters.

Same issue +1