" * Items may vanish when moving them to the inventory
- This is due to desync between client and server. Logging out/back in will resolve the missing issues and they will be back where they belong"
This works NOT if you place an item in the inventory of a horse.
I tested it right now.
- Placed an item in the inventory of a horse-> it vanished the same moment
- logged out and back in → the item is not in my inventory neither in the inventory of the horse
- restarted the server and logged in back → same result. The item is still gone.