Digsite Map Boss instant kill after death

Tier 11 Map in HC The boss died right before the animation started, but it was triggered regardless. Three seconds later I died instantly exactly like depicted in the footage I’ve posted bellow.

https://www.reddit.com/r/PathOfExile2/comments/1o0p6pm/how_does_one_counter_this_absolute_bs/

https://www.reddit.com/r/PathOfExile2/comments/1ndg4b2/post_boss_death_effects_have_to_go_move_not_safe/