There is still a bug causing the deepaight chest in the King's Fall raid not to spawn. I don't see people talking about it, but it just happened again in my most recent raid. Final glyph gets shot, the message pops up saying that it has been accepted... and no deepsight chest spawns after culling the King. Only two things seem to be consistent between the runs where I've had this bug that I have noticed: 1. Someone who has already looted the deepsight chest shoots the final glyph. 2. The current bonus challenge was completed in the same run. Hope this helps in some way.