Summary
If a player is wearing armor that has been updated using the item updater, the armor will be duped when they join the server.
Steps to reproduce
Here's an item to reproduce this issue: https://pastebin.com/y3WUfTEU [Legacy attachment omitted]
Equip this item in an armor! slot. Now update the item to this: https://pastebin.com/8wA1mmK3 reload mm leave and rejoin the server and the item will be duped when updating. [Legacy attachment omitted]
Current behavior
The item will be duped perhaps even multiple times. The original item which is still equipped won't be updated.
[Legacy attachment omitted]