Necropolis Cascades chest locked by a wisp issue

There's a chest in the Necropolis halls - Cascades which is located behind a door locked by a wisp mech that is resolved from doing the braziers on the room to the right (The Spectral Court). It is where you have to Interact with a coffin and light up the braziers on a certain sequence to complete the puzzle.

After lighting up the puzzles, I was able to get the coffin's rewards but the wisp does not spawn/follow for me to open the chest back in the Cascades. Am I missing something or is this a known issue?