[Fissure missions enemies spawning in walls from the fissure.]

So for 4 fissure missions (2 after a clean reinstall of the game) I've had the enemies that spawn from the fissures spawn deep inside walls not allowing me to fill up to 10 reactants to get my reward this happened on survivals and on exterminate missions. I understand DE is trying to make the game a tad more difficult but making it so you cant actually complete a mission is not difficult just annoying.
As shown in the picture enemies are spawning in ceilings and walls the few reactant i had was from the lucky enemies that were just close enough to be turned over.