Description of the Bug

The server randomly crashes when loading certain chunks at random for no apparent reason. I run my server with the provided configuration in curse forge for the server without modification. No mods added. My pc has 20gb RAM but the server runs at 16gb maximum. Some portals in my world are bugged when broken witch causes the bugged texture to expand indefinitely.

Expected Behaviour

The server should not crash at random occurences

Modpack Version

Latest for Minecraft 1.12.2

Screenshots

My launch command:

My crash error description is below for more details check the pastebin for the complete crash report.

Log

https://pastebin.com/b8zfQ81M

Extra Info

---- Minecraft Crash Report ----
// Don't do that.

Time: 2024-06-21 12:49:34 EDT
Description: Exception ticking world

java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(Unknown Source)
at java.util.HashMap$KeyIterator.next(Unknown Source)
at net.minecraft.entity.EntityTracker.sendLeashedEntitiesInChunk(EntityTracker.java:386)
at net.minecraft.server.management.PlayerChunkMapEntry.sendToPlayers(PlayerChunkMapEntry.java:162)
at net.minecraft.server.management.PlayerChunkMap.tick(SourceFile:165)
at net.minecraft.world.WorldServer.tick(WorldServer.java:227)
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:756)
at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:397)
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:668)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Unknown Source)