I noticed the zombies were migrating way more far than before, but i am pretty sure it is a respawn, i cleared the zone, went at the end of the street to loot then came back and all the zombies were back like if i killed none; Having the feeling of killing the respawning hordes in loop, again and again.
Since the build 41, it is the first time i'm having this issue, looking on my past youtube videos and clearly this wasn't happening this way.