Skript/Server Version

[11:20:51 INFO]: [Skript] Skript's aliases can be found here: https://github.com/SkriptLang/skript-aliases
[11:20:51 INFO]: [Skript] Skript's documentation can be found here: https://docs.skriptlang.org/
[11:20:51 INFO]: [Skript] Skript's tutorials can be found here: https://docs.skriptlang.org/tutorials
[11:20:51 INFO]: [Skript] Server Version: 1.20.6-115-9d6f2cc (MC: 1.20.6)
[11:20:51 INFO]: [Skript] Skript Version: 2.8.5 (skriptlang-github)
[11:20:51 INFO]: [Skript] Installed Skript Addons:
[11:20:51 INFO]: [Skript]  - Skellett v2.0.10 (https://forums.skunity.com/resources/skellett.24/)
[11:20:51 INFO]: [Skript]  - skUtilities v0.9.2 (https://tim740.github.io/)
[11:20:51 INFO]: [Skript]  - SkQuery v4.1.10
[11:20:51 INFO]: [Skript]  - SkBee v3.5.2 (https://github.com/ShaneBeee/SkBee)
[11:20:51 INFO]: [Skript]  - SkJade v1.4.3 (https://www.github.com/Ankoki-Dev/SkJade)
[11:20:51 INFO]: [Skript] Installed dependencies:
[11:20:51 INFO]: [Skript]  - WorldGuard v7.0.10+d9424b1

Bug Description

reloading any skript file gives me the error:

[11:20:01 ERROR]: Caught previously unhandled exception :
[11:20:01 ERROR]: Paper Async Command Builder Thread Pool - 0
java.util.ConcurrentModificationException: null
at java.base/java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:1023) ~[?:?]
at java.base/java.util.LinkedHashMap$LinkedValueIterator.next(LinkedHashMap.java:1052) ~[?:?]
at net.minecraft.commands.Commands.fillUsableCommands(Commands.java:536) ~[paper-1.20.6.jar:1.20.6-115-9d6f2cc]
at net.minecraft.commands.Commands.sendAsync(Commands.java:495) ~[paper-1.20.6.jar:1.20.6-115-9d6f2cc]
at net.minecraft.commands.Commands.lambda$sendCommands$6(Commands.java:474) ~[paper-1.20.6.jar:1.20.6-115-9d6f2cc]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?]
at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]

Expected Behavior

No Error

Steps to Reproduce

/skript reload

Errors or Screenshots

[11:20:01 ERROR]: Caught previously unhandled exception :
[11:20:01 ERROR]: Paper Async Command Builder Thread Pool - 0
java.util.ConcurrentModificationException: null
at java.base/java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:1023) ~[?:?]
at java.base/java.util.LinkedHashMap$LinkedValueIterator.next(LinkedHashMap.java:1052) ~[?:?]
at net.minecraft.commands.Commands.fillUsableCommands(Commands.java:536) ~[paper-1.20.6.jar:1.20.6-115-9d6f2cc]
at net.minecraft.commands.Commands.sendAsync(Commands.java:495) ~[paper-1.20.6.jar:1.20.6-115-9d6f2cc]
at net.minecraft.commands.Commands.lambda$sendCommands$6(Commands.java:474) ~[paper-1.20.6.jar:1.20.6-115-9d6f2cc]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?]
at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]

Other

No response

Agreement

• I have read the guidelines above and affirm I am following them with this report.

Can you recreate this without addons?

1. I can confirm this with no addons

2. this error is something SkBriggy had a while back (due to registering vanilla MC type commands with Command API).
   And it's now something that happens in Paper due to paper doing some internal changes with their command api and how commands are registered internally.
   I THINK it's something to do with unregistering then re-registering commands when reloading a script.

Happened to me too. Skript 2.8.6, SkBee 3.5.2, skript-reflect 2.4. Paper 1.20.6