I was west of severograd on a server,went to the military checkpoint to loot and saw the zombies standing still,went next to one of them,shot him twice and nothing,it was petrified.I took a couple on screenshots and went to the tents,same issue,all the zombies stuck in place and no loot to be found so i decided to relog.Done.Was spawned at the gas station,went back to the spot,zombies were ok this time. https://steamcommunity.com/id/ToTaLw/screenshots/
Here are some screenshots to prove it(only on one zombie).Also if you look at the next 2 screenshots you can see a floating texture at the broken ship,thought you might wanna fix that.