Flaky test monkey_business: The runed girder taking damage after deletion

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Flaky tests were detected in this test run. This means that there was a failure that was cleared when the tests were simply restarted.
Failures:

monkey_business: [12:08:35] Runtime in code/game/atom/atom_defense.dm,21: The runed girder taking damage after deletion
proc name: take damage (/atom/proc/take_damage)
src: the runed girder (/obj/structure/girder/cult)
src.loc: null
call stack:
the runed girder (/obj/structure/girder/cult): take damage(90, "brute", "", 1, null, 0)
the runed girder (/obj/structure/girder/cult): collision damage(the bubblegum (/mob/living/simple_animal/hostile/megafauna/bubblegum), 30000, 4)
the runed girder (/obj/structure/girder/cult): move crushed(the bubblegum (/mob/living/simple_animal/hostile/megafauna/bubblegum), 30000, 4)
the bubblegum (/mob/living/simple_animal/hostile/megafauna/bubblegum): move crush(the runed girder (/obj/structure/girder/cult), 30000, 4, 0)
the bubblegum (/mob/living/simple_animal/hostile/megafauna/bubblegum): PushAM(the runed girder (/obj/structure/girder/cult), 30000)
the bubblegum (/mob/living/simple_animal/hostile/megafauna/bubblegum): Bump(the runed girder (/obj/structure/girder/cult))
the plating (63,117,3) (/turf/open/floor/plating): Enter(the bubblegum (/mob/living/simple_animal/hostile/megafauna/bubblegum))
the bubblegum (/mob/living/simple_animal/hostile/megafauna/bubblegum): Move(the plating (63,117,3) (/turf/open/floor/plating), 4, 0, 1)
the bubblegum (/mob/living/simple_animal/hostile/megafauna/bubblegum): Move(the plating (63,117,3) (/turf/open/floor/plating), 4, 0, 1)
the bubblegum (/mob/living/simple_animal/hostile/megafauna/bubblegum): Move(the plating (63,117,3) (/turf/open/floor/plating), 4, 0, 1)
the bubblegum (/mob/living/simple_animal/hostile/megafauna/bubblegum): Move(the plating (63,117,3) (/turf/open/floor/plating), 4, 0, 1)
the bubblegum (/mob/living/simple_animal/hostile/megafauna/bubblegum): Move(the plating (63,117,3) (/turf/open/floor/plating), 4, 0, 1)
the bubblegum (/mob/living/simple_animal/hostile/megafauna/bubblegum): Move(the plating (63,117,3) (/turf/open/floor/plating), 4, 0, 1)
/datum/move_loop/has_target/mo... (/datum/move_loop/has_target/move_towards): move()
/datum/move_loop/has_target/mo... (/datum/move_loop/has_target/move_towards): process()
Movement Loops (/datum/controller/subsystem/movement): pour bucket(/list (/list))
Movement Loops (/datum/controller/subsystem/movement): fire(0)
Movement Loops (/datum/controller/subsystem/movement): ignite(0)
Master (/datum/controller/master): RunQueue()
Master (/datum/controller/master): Loop(2)
Master (/datum/controller/master): StartProcessing(0) at code/game/atom/atom_defense.dm:21