This has been a bug since release. Unfortunately, Bungie has moved well past this issue. Ruined a handful of solo flawless attempts for me but in the end I managed to do it fortunately.

Sorry for asking but can you specify if the bells kill you even if you are near them, becouse from how you formulated i cant understend if you say they kill you if you are not near them witch is an intendet feauter of the dungeon, or if they kill you even if you are near them wich that will be a problem, P.S un the nightmare relm around the bells is a black circle if you are outside the circle when the bell ring you die, its an intendet feauter