[Crash]: Rerolling enchantments on book/shovel/pickaxe crashes server (modpack "Dungeon heroes RPG series")

[H0401]

Mod Loader (Required)

Fabric

Minecraft Version(s) (Required)

1.21.1

Mod Version(s) (Required)

v21.1.0

Notes (Required)

1. Opens enchanting table
2. Puts in book/pickaxe/shovel and lapis
3. Starts rerolling enchantments
4. Then randomly server crashes

Seems so that only pickaxes/shovels/books can trigger this crash since with weapons it didnt happen.

I am sorry for that i do not own the crash report, for some reason my server only generates logs and has no crash-reports folder. crash starts at line 1244 in the log.

Crash Report (Required)

https://gist.github.com/H0401/927c8d179e3fb048f986689a56d2e937

latest.log (Optional)

https://gist.github.com/H0401/927c8d179e3fb048f986689a56d2e937

[Fuzss]

Can you reproduce the issue with only Easy Magic installed?

[H0401]

Sorry i missclicked about fixing the issue.

I didnt manage to reproduce the crash on server with only easy magic and easy anvils installed same version of everything.

I gave the logs to chatgpt and he mentioned that some method is trying to remove() from immutable list.

it also mention the list might become immutable if:

• The tool or book has specific metadata, (most likely not the cause happens even with recently crafted diamond shovel)
• There's a conflicting enchantment, (no idea whats a conflicting enchantment)
• Or the enchantability level is incompatible, (no idea about this either)
• Or a mod (like Spell Engine, Wizards, Trinkets, etc.) has injected enchantments incorrectly. (most of the enchants from these mods appear to be functioning correctly)

Hope this atleast helps a little.

Edit: For some reason after changing "enchantment_hint" to "ALL" and restarting the server. The error still appears in the console but it doesnt crash the server. Honestly i have absolute no idea whats going on now...

[Fuzss]

It's a mod conflict, but which mod is the issue isn't clear from the logs.

Please do a binary search to find out which mod is conflicting. You always remove half of your mods, again and again, until you find which one is conflicting.

[Afftix]

Mod "Enchant Limiter" seems to be a problem. It works fine without it. I think, when you enchant book, it can get 4 enchantments, but Limiter is only 3 enchantments. Maybe easy magic forces it to be 4 so it just crashes?