In the Firewatch FG quest TR_m1_FG_Mandaran, you are sent to kill Gamras Silni, a hostile outlaw that the player might have easily already killed at this point. Quest stage 15 only triggers on Silni's death, but only if you already got the quest, making it impossible to get.

There actually WAS a failsafe implemented for this, but it still filters for the death of TR_m1_O_Jalian, a completely different outlaw. The dialogue with Brandt for when Senillos Tulnus is dead also still wrongly uses Jalian's name.