The Skyston Crypt elevated church floor is bugged when doing certain actions.
I tried playing some music between Ivan kills and the game locked up in the music UI. I could not open any menu or escape the music UI. I had to hard quit the game from the taskbar.
Lastly, while not game-breaking, many times my teleports will fail when standing on this floor and I get the message in the middle of the screen saying it failed. I can try again or move a few feet and it might work as intended, or if I move to the stone floor in front of the elevated floor.
I have reviewed all the data you have provided and thank you for the information. Due to the type of issue you mention and how it does not match the expected behavior, this thread would be better addressed in the Bug Reports section
I have moved the thread. Hope this helps and see you in Aeternum!
Additional information: I encountered this same bug while typing to play musical instruments in the open world at a few other locations. It seems if I’m standing on something just elevated from ground level or if my feet aren’t at the same height
on top of a small “hump” nest to where Mordici spawns at Skysong. However, there was another player playing not much further away but on flat land
standing on the Shrine of Sisyphos fast travel point in Endless Shore