The Warden Vault Quest Bug

On the quest The Warden Vault accessing the game thought steam.

For the lock with the three ghosts (or maybe one ghost in three different places) the skeletons where the ghosts spawn from are not present in my game.

Video of this  here - https://youtu.be/WOoCZPqrDTA

Things which have not resolved this bug.

Restarting the game, verifying all files via steam, ensuring all drivers on my pc are up to date, restarting my pc, uninstalling the reinstalling the game.

Any advice?