No experimental servers will be up for another 12 hours or so. With the stable update they have been removed and will come back up tomorrow.

Number 1: This is a place to track bugs, not suggestions.
Number 2: the Devs have said that this would put too much a of strain on the servers. Instead of just tracking zombie 1, zombie 2, etc, the server would have to track what types of clothes each zombie had on. Down voting to bury this.

Have you tried having player 2 log out and then in a second time after the items are duped?

Can confirm. In experimental, the player's gun will not fire and you cannot aim down the sights.
Additionally, all attachments on the gun are invisible.
Can be fixed by re-logging. All attachments will appear and be useable.

This doesn't make you sick, this notifies you that your sickness is leaving. This isn't a bug.