Same issue here but if I get close to them I can kill them or make them react

Found a bunch of those already. They just stand there and don't move until you get really close to them. You can actually sneak up on them from behind and get an easy kill.

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I've experienced this as well, if I do again today I will make a video and upload it here.

I can confirm this. So far I have only met zombies that were standing in one place instead of "roaming"/loitering/simply walking around in random patterns. I hope that is something that will be looked at at a later stage otherwise I fear Zeds will be a very boring occurrence imho. Next time I spot it I will make sure to record it.

Seen it happen. It seemed to be just a temporary thing per server.