Zombies are not following

It seems the zombies have gotten dumber with the last patch, most of the time they are not following me or only some of them, I constantly need to backtrack and when doing so my missing zombies will simply teleport next to me. If I simply continue on they will never re-appear and I will have to re-summon them.

I finally decided to stop backtracking as I was doing so constantly, now I simply re-summon them but this will become a nightmare when I will be able to summon 10+ zombies. I don't know if this issue is also happening with spectres and skeletons as I haven't found the skill gem yet.

same thing happening. They will stop at some invisible line on the map. I can walk forward 2 steps and the become invisible.

I walk back two steps and they become visible and most of the time will start to follow.