I would go through the bug report steps, but if more people could verify the issue so I can make sure it's not just our server that would be great..
Have server set to friendly fire - off
Get stun baton
Get repulser mod
"Accidentally" hit zombie while your party member is near it (on a roof preferably)
Watch as friend ragdolls off the roof in dramatic fashion
LMK your results 🤪