Invincible Enemies in Void Fissure Missions

[(PSN)zDNAngel]

Ever since the Chains of Harrow update, I've been running into invincible enemies on Void Fissure missions. I normally just go in to Exterminate Void Fissures to farm some traces but then I run into that one enemy that does not want to die. Mind you, this enemy is level 10 and my Tigris Prime can one shot level 50+ enemies. Also, it didn't receive any status effects from my 100% status chance akstilleto. There have been instances where if I die, the invincibility goes away and I wreck them but then another enemy becomes invincible. So i'll leave them alone but the respawn system just respawns the same invincible enemy further into the map with me. This is a pain with napalms. Please fix. :(