Using essentialsx /kit featuring a signed book causes an insta discconect, can be abused to duplicate items.

[AdaptableRuben]

Spark link

https://spark.lucko.me/OJy0T4dRb0

Expected behavior

Should be able to get the book from the kit without any issues

Observed/Actual behavior

You get disconnected and the playerdata fails to save causing it rollback to the point where you last logged off

Steps/models to reproduce

1. Install a server with purpurmc

2. Install essentialsX and Purpurmc on the server or every plugin in this screenshot if possible

3. Write and sign a book

4. create a kit with the book with /createkit (name) (time)

5. Redeem the kit with /kit (name)

6. See the error happened

Note: This error does not happen in a locally hosted server, you must use an offsite server for it to work.

Purpur version

Current Purpur Version: 1.21-2261-14136b8 (MC: 1.21)*

• You are running the latest version Previous: 1.21-2260-5e70800 (MC: 1.21)

Agreements

• [X] I am running the latest version of Purpur available from https://purpurmc.org/downloads.
• [X] I have searched for and ensured there isn't already an open issue regarding this.
• [ ] I ticked all the boxes without actually reading them
• [X] My version of Minecraft is supported by Purpur.

Other

This issue might be related to other plugins like Essentialx or Procollib since im using dev version installs to update the server to 1.21 earlier.

Error from console: https://pastebin.com/T67Kwh43

[granny]

Known Paper issue. This has already been fixed by them, so next time I pull upstream the fix will be in Purpur.

[AdaptableRuben]

Great