https://streamable.com/43pz32
https://streamable.com/hhkaa3
https://streamable.com/9r9r5v
These 3 videos are a few examples of me dying to nothing in that circle nothing hitting me no animation happening I just die
IDK if this is their idea of "fun" or it is an actual bug but it needs fixing asap I'm losing my hair because of it 

Are these videos from recently? Since the fix they added in the maintenance last week i have that issue much less often. From what i remember it comes from the hitbox of the sangoon dashes lingering, and desyncing on screen. Its best to avoid the dash area for a few seconds after it disappeared to prevent it from happening as often.
(Understand the frustration though and + 1 on that, it's made me pull out my hair multiple times before as well. Really needs a reliable fix)

DK one was an hour ago ( I just finished them)
and Witch was last week

I died today few times to this bug on two different characters so It's still here. For me it's like 4 out of 5 times it will happen

Still there and it' s horrible

This is also happening to me as well, i thought i was LOSING IT.

1. In all 3 videos you dashed immediately after the animation of the yellow line to the place where it was, I think it is obvious that you do not need to dash in that line place for at least 2-3 seconds. You just kill mobs, they don't damage a lot, you don't need always jump. Although this is really a mechanical flaw, since the line is no longer visible visually, but at least it is clear why you died.

2. It still really annoys me when the Sangoon jumps out of the map and you simply cannot hit him.

3. And it is full rng to cc c10 Sangoon, you just cant know when to do it, when on c8-c9 you can see glowing.

4. And when Sangoon uses his roar and you use iframe in the same time, it doesn't work for some reason and you get cc. You always should use iframe before roar, otherwise you will die in iframe.

So many bugs on this boss.