I sent 2 bug reports in this morning.
FYI slight spoilers if you haven’t done the raid.
During boss 1 when the big ice spike spawns that needs to be lit. I had it be invisible on my screen but others seemed to be fine. I did hear the sound clue of it hitting the floor and it did remove my frost stacks after the mechanic so it was only a visual glitch.
Boss 4 This is where the bug happened more frequently from a few scenerios.
I sent a report straight after this happened. During the 1st hell phase the big spider was invisible for me + atleast 1 other mentioned it and I couldn’t seem to hit it (but I also couldn’t know where it was apart from guess near the tank).
This similarly happened again on the 3rd hell phase where only the pink abberration minion was invisible for me (and maybe for some others? Its hard to know during these fights as people are busy talking about the fight/mechanics).
During the second shield phase I noticed that the corrupt adds that spawn periodically in the center of the room were invisible for me. I could see 2 of them but there was likely 2/3 invisible ones next to them.
I heard 1 other person mention invisible minions during the fight so this isn’t a bug limited only two me (we’re both EU players if that helps). But trying to find out more during the boss fight with lots going on was difficult.
On another note, it could be related, players are sometimes invisible to other players in the raid but again I don’t know how/why and its not frequently happening.