Four times in the last week, on this character, I have died to the water drop via fall damage in the Rookery. This happened in a Follower Dungeon and in a Mythic + 6 key.
No, no one in my party cast some kind of water collision spell.
I was the only one who died. It happened twice in a row and on the third fall, I cast Flap to avoid it.
Prior to last week, I’ve done that dungeon many times and never had an issue with the water drop. I’m assuming this is a bug you need to fix. Please do.