[1.21.1] Server freezes when MineColonies raiders use arrows

[Nymraks]

Modloader

NeoForge

Minecraft version

1.21.1

Modloader version

21.1.116

Mod version

1.15.2

TenshiLib version

2.2.5

Description

I'm encountering server freezes lasting several seconds during MineColonies raids. These freezes consistently occur when MineColonies raiders using bows are active.

The freeze always coincides with repeated errors in the server console related to arrow entities and chunk save/unload operations.

I tested this using only the latest versions of MineColonies and Improved Mobs, along with their dependencies.
It seems to not affect MineColonies guards.

Steps to reproduce

1. Get attacked by MineColonies raiders (e.g. in a barbarian camp or during a raid) using bows or crossbows.
2. Leave the area (for example by teleporting elsewhere), presumably triggering chunk unload/save.
3. A server freeze occurs (sometimes lasting up to ~10 seconds), accompanied by repeated console errors.

Mods that might affect the issue

https://www.curseforge.com/minecraft/mc-mods/minecolonies/files/7426008

Logs

https://gist.github.com/Nymraks/6f82dfcb539559bf6eb862e1c4e0f4cc

[Nymraks]

After further testing, the only way I’ve found to completely avoid the issue is to disable the USEITEM feature of Improved Mobs for all MineColonies entities using "Entity Configs" = ["minecolonies|USEITEM", ... ]

I attempted to disable this feature both by targeting MineColonies entities directly via their entity IDs and by using the minecolonies:raiders entity tag, but the issue still occurs in those cases.

The problem only stops when the USE_ITEM feature is fully disabled for all MineColonies entities, which makes me think I may be missing something in the configuration, or that this feature is still being applied in some way despite the exclusions.