Just encountered invisible azlar in def team bug in var.
Def team was consist from Mother North - Shadereave - Zulag - Guin - Azlar.
I killed Azlar under Shadereave buff. He awoke as Draugr. I killed him again and in same turn MN fired. Azlar was resurrected as invisible original, and cannot able to target via my Magni + Lepus, but can strike well.
After my defeat he was in full health (because other MN heals affected invisible him).