Thanks for taking the time to open a bug report!

Describe the bug
On 1.19.2, if you install WorldGuard and ItemJoin and you create a region, when you join, ItemJoin's items given to you on joining will disappear from your inventory if you move in that region.

To Reproduce
Steps to reproduce the behavior:

1. Create a 1.19.2 Server
2. Install WorldGuard
3. Install ItemJoin
4. Create a WorldGuard region (No specific flags needed, just a default one)
5. Create an ItemJoin item with the JOIN flag, so you get that item on join.
6. Disconnect in the WorldGuard region.
7. Reconnect
8. Move your camera and then the item disappears.

Expected behavior
The Item does not disappear.

Screenshots
If applicable, add screenshots to help explain your problem.

Pastebin
No errors in the console.

Please complete the following information:

• Resource Version and Build Number: v5.2.5-RELEASE-b850
• Server Version: 1.19.2 PAPER

Additional context
Add any other context about the problem here.

Confirmed, working on a fix for v6.0.0.

Apologies this took so long, this seems to now be fixed in the latest snapshot.
I was able to replicate the issue and produce a fix for this.

v6.0.0-Snapshot is now available.
Link; https://ci.craftationgaming.com/job/ItemJoin/882/
Remember to remove your old ItemJoin.jar file