Describe the bug
People can pick up beacons out from the "Change beacon effect"

To Reproduce
Steps to reproduce the behavior:

1. Go to a beacon waypoint
2. Click on the "Change beacon effect" icon
3. Pick it up into your inventory
4. Get a free beacon

Expected behavior
It should either not let people grab them, or at least disappear the items from their inventory when closing the menu

Screenshots
I don't have screenshots but I have the error logs of what is happening in console:

https://pastebin.com/4C25SYyP

Desktop (please complete the following information):

• OS: Windows 8
• Browser: Vivaldi
• Version: 22

Additional context
Nothing else that I can think of.

Mojang's update for 1.19.1 replaced 1_19_R1 rather than creating 1_19_R2 for NMS, and because of this, the plugin can only support either 1.19 or 1.19.1 and 1.19.2. You will either have to use version 1.4.0 or update the server. (This was resolved via Discord)