"Unnamed Heartwood" ascendency seem to not be fully working

Often my totem seem to take to much damage and even though it say it will stay in play for 6second after they're life reach 0, they instantly despawn (like on the one shot attack from bosses or big attack from the commander in the temple). Doest seem to be due to time duration if i spawn them right in the place where it would obliterate them often they just despawn after taking the hit.