[Bug]: Lagging and Crashing

[IndigobyJas]

What happened?

I was playing on a survival world and the game suddenly started lagging and crashing. This was more noticeable when new chunks were loading. I was thought it was one specific mod but was told it was this one.

Minecraft Version

1.20.1

Ice and Fire version

2.1.13

Citadel version

2.6.0

Relevant log output

[18:58:56] [Server thread/INFO]: Saving and pausing game...
[18:58:56] [Server thread/INFO]: Saving chunks for level 'ServerLevel[1.20.1 Survival World 1]'/minecraft:overworld
[18:58:56] [Server thread/INFO]: Saving chunks for level 'ServerLevel[1.20.1 Survival World 1]'/minecraft:the_end
[18:58:56] [Server thread/INFO]: Saving chunks for level 'ServerLevel[1.20.1 Survival World 1]'/minecraft:the_nether
[18:59:01] [Render thread/WARN]: Received passengers for unknown entity
[18:59:12] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[18:59:12] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[18:59:15] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 2900ms or 58 ticks behind
[18:59:15] [Render thread/WARN]: Received passengers for unknown entity
[18:59:19] [Render thread/WARN]: Received passengers for unknown entity
[18:59:31] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[18:59:31] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[18:59:36] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[18:59:43] [Server thread/WARN]: Found reference to unknown structure 'supplementaries:way_sign' in chunk [-93, -38], discarding
[18:59:43] [Server thread/WARN]: Found reference to unknown structure 'supplementaries:way_sign' in chunk [-92, -38], discarding
[18:59:43] [Server thread/WARN]: Found reference to unknown structure 'supplementaries:way_sign' in chunk [-91, -38], discarding
[18:59:43] [Server thread/WARN]: Found reference to unknown structure 'supplementaries:way_sign' in chunk [-93, -37], discarding
[18:59:43] [Server thread/ERROR]: Unknown structure start: supplementaries:way_sign
[18:59:43] [Server thread/WARN]: Found reference to unknown structure 'supplementaries:way_sign' in chunk [-92, -37], discarding
[18:59:43] [Server thread/WARN]: Found reference to unknown structure 'supplementaries:way_sign' in chunk [-91, -37], discarding
[18:59:43] [Server thread/WARN]: Found reference to unknown structure 'supplementaries:way_sign' in chunk [-93, -36], discarding
[18:59:43] [Server thread/WARN]: Found reference to unknown structure 'supplementaries:way_sign' in chunk [-92, -36], discarding
[18:59:43] [Server thread/WARN]: Found reference to unknown structure 'supplementaries:way_sign' in chunk [-91, -36], discarding
[18:59:43] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[18:59:45] [Server thread/WARN]: Tried to load a DUMMY block entity @ BlockPos{x=-1423, y=-32, z=-462} but found not block entity block Block{minecraft:air} at location
[18:59:45] [Server thread/WARN]: Tried to load a block entity for block Block{minecraft:air} but failed at location BlockPos{x=-1423, y=-32, z=-462}
[18:59:55] [Server thread/WARN]: Fetching packet for removed entity ItemEntity['Air'/4023, l='ServerLevel[1.20.1 Survival World 1]', x=-4493.50, y=62.52, z=-753.50, removed=DISCARDED]
[19:00:00] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:00:07] [Server thread/WARN]: Fetching packet for removed entity ItemEntity['Air'/5075, l='ServerLevel[1.20.1 Survival World 1]', x=-4188.43, y=-35.00, z=-670.67, removed=DISCARDED]
[19:00:07] [Server thread/WARN]: Fetching packet for removed entity ItemEntity['Air'/5076, l='ServerLevel[1.20.1 Survival World 1]', x=-4187.93, y=-36.00, z=-666.43, removed=DISCARDED]
[19:00:18] [Server thread/WARN]: Fetching packet for removed entity ItemEntity['Air'/6026, l='ServerLevel[1.20.1 Survival World 1]', x=-3979.88, y=-54.00, z=-564.85, removed=DISCARDED]
[19:00:19] [Render thread/WARN]: Unable to play empty soundEvent: minecraft:entity.cod.ambient
[19:00:38] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:00:38] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:00:38] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:00:38] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:00:55] [Render thread/INFO]: [System] [CHAT] Spawns
[19:00:55] [Render thread/INFO]: [System] [CHAT] Ditto: 52.63%, Eevee: 47.37%
[19:01:09] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:01:16] [Render thread/WARN]: Unable to play empty soundEvent: minecraft:entity.tropical_fish.ambient
[19:01:17] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:01:17] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:01:17] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:01:17] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:01:17] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:01:18] [Server thread/WARN]: Fetching packet for removed entity ItemEntity['Air'/9563, l='ServerLevel[1.20.1 Survival World 1]', x=-3687.13, y=-30.00, z=48.88, removed=DISCARDED]
[19:01:19] [Server thread/WARN]: Fetching packet for removed entity ItemEntity['Air'/9616, l='ServerLevel[1.20.1 Survival World 1]', x=-3622.03, y=30.00, z=65.88, removed=DISCARDED]
[19:01:19] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:01:19] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:01:19] [Render thread/WARN]: Unable to play empty soundEvent: minecraft:entity.puffer_fish.ambient
[19:01:28] [Server thread/WARN]: Fetching packet for removed entity ItemEntity['Air'/9621, l='ServerLevel[1.20.1 Survival World 1]', x=-3521.44, y=-43.67, z=70.34, removed=DISCARDED]
[19:02:06] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 33686ms or 673 ticks behind
[19:02:06] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:02:06] [Server thread/ERROR]: Unknown structure piece id: supplementaries:mineshaft_elevator
[19:02:09] [Server thread/WARN]: Tried to load a DUMMY block entity @ BlockPos{x=-3572, y=-9, z=129} but found not block entity block Block{minecraft:air} at location
[19:02:09] [Server thread/WARN]: Tried to load a block entity for block Block{minecraft:air} but failed at location BlockPos{x=-3572, y=-9, z=129}
[19:02:23] [Server thread/WARN]: Tried to load a DUMMY block entity @ BlockPos{x=-3658, y=17, z=175} but found not block entity block Block{minecraft:air} at location
[19:02:23] [Server thread/WARN]: Tried to load a block entity for block Block{minecraft:air} but failed at location BlockPos{x=-3658, y=17, z=175}
[19:02:23] [Server thread/WARN]: Tried to load a DUMMY block entity @ BlockPos{x=-3664, y=17, z=177} but found not block entity block Block{minecraft:air} at location
[19:02:23] [Server thread/WARN]: Tried to load a block entity for block Block{minecraft:air} but failed at location BlockPos{x=-3664, y=17, z=177}
[19:02:23] [Server thread/WARN]: Tried to load a DUMMY block entity @ BlockPos{x=-3662, y=17, z=176} but found not block entity block Block{minecraft:air} at location
[19:02:23] [Server thread/WARN]: Tried to load a block entity for block Block{minecraft:air} but failed at location BlockPos{x=-3662, y=17, z=176}
[19:02:23] [Server thread/WARN]: Tried to load a DUMMY block entity @ BlockPos{x=-3660, y=17, z=177} but found not block entity block Block{minecraft:air} at location
[19:02:23] [Server thread/WARN]: Tried to load a block entity for block Block{minecraft:air} but failed at location BlockPos{x=-3660, y=17, z=177}
[19:02:23] [Server thread/WARN]: Tried to load a DUMMY block entity @ BlockPos{x=-3479, y=17, z=125} but found not block entity block Block{minecraft:air} at location
[19:02:23] [Server thread/WARN]: Tried to load a block entity for block Block{minecraft:air} but failed at location BlockPos{x=-3479, y=17, z=125}
[19:02:46] [Server thread/WARN]: Tried to load a DUMMY block entity @ BlockPos{x=-3655, y=-36, z=250} but found not block entity block Block{minecraft:air} at location
[19:02:46] [Server thread/WARN]: Tried to load a block entity for block Block{minecraft:air} but failed at location BlockPos{x=-3655, y=-36, z=250}
[19:02:50] [Server thread/WARN]: Tried to load a DUMMY block entity @ BlockPos{x=-3650, y=-29, z=277} but found not block entity block Block{minecraft:air} at location
[19:02:50] [Server thread/WARN]: Tried to load a block entity for block Block{minecraft:air} but failed at location BlockPos{x=-3650, y=-29, z=277}
[19:02:50] [Server thread/WARN]: Tried to load a DUMMY block entity @ BlockPos{x=-3651, y=-28, z=281} but found not block entity block Block{minecraft:air} at location
[19:02:50] [Server thread/WARN]: Tried to load a block entity for block Block{minecraft:air} but failed at location BlockPos{x=-3651, y=-28, z=281}
[19:02:52] [Server thread/WARN]: Tried to load a DUMMY block entity @ BlockPos{x=-3662, y=-25, z=313} but found not block entity block Block{minecraft:air} at location
[19:02:52] [Server thread/WARN]: Tried to load a block entity for block Block{minecraft:air} but failed at location BlockPos{x=-3662, y=-25, z=313}
[19:02:52] [Server thread/WARN]: Tried to load a DUMMY block entity @ BlockPos{x=-3662, y=-24, z=315} but found not block entity block Block{minecraft:air} at location
[19:02:52] [Server thread/WARN]: Tried to load a block entity for block Block{minecraft:air} but failed at location BlockPos{x=-3662, y=-24, z=315}
[19:02:52] [Server thread/WARN]: Tried to load a DUMMY block entity @ BlockPos{x=-3657, y=-25, z=316} but found not block entity block Block{minecraft:air} at location
[19:02:52] [Server thread/WARN]: Tried to load a block entity for block Block{minecraft:air} but failed at location BlockPos{x=-3657, y=-25, z=316}
[19:04:22] [Server thread/ERROR]: Encountered an unexpected exception
java.util.ConcurrentModificationException: null
	at java.util.ArrayList.forEach(ArrayList.java:1513) ~[?:?]
	at com.github.alexthe666.iceandfire.world.IafWorldData.lambda$save$3(IafWorldData.java:100) ~[iceandfire-2.1.13-1.20.1-beta-5.jar%23274!/:2.1.13-1.20.1]
	at java.util.HashMap.forEach(HashMap.java:1421) ~[?:?]
	at com.github.alexthe666.iceandfire.world.IafWorldData.m_7176_(IafWorldData.java:97) ~[iceandfire-2.1.13-1.20.1-beta-5.jar%23274!/:2.1.13-1.20.1]
	at net.minecraft.world.level.saveddata.SavedData.m_77757_(SavedData.java:36) ~[client-1.20.1-20230612.114412-srg.jar%23323!/:?]
	at net.minecraft.world.level.storage.DimensionDataStorage.m_164865_(DimensionDataStorage.java:128) ~[client-1.20.1-20230612.114412-srg.jar%23323!/:?]
	at java.util.HashMap.forEach(HashMap.java:1421) ~[?:?]
	at net.minecraft.world.level.storage.DimensionDataStorage.m_78151_(DimensionDataStorage.java:126) ~[client-1.20.1-20230612.114412-srg.jar%23323!/:?]
	at net.minecraft.server.level.ServerLevel.m_8806_(ServerLevel.java:758) ~[client-1.20.1-20230612.114412-srg.jar%23323!/:?]
	at net.minecraft.server.level.ServerLevel.m_8643_(ServerLevel.java:737) ~[client-1.20.1-20230612.114412-srg.jar%23323!/:?]
	at net.minecraft.server.MinecraftServer.m_129885_(MinecraftServer.java:507) ~[client-1.20.1-20230612.114412-srg.jar%23323!/:?]
	at net.minecraft.server.MinecraftServer.m_195514_(MinecraftServer.java:532) ~[client-1.20.1-20230612.114412-srg.jar%23323!/:?]
	at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:824) ~[client-1.20.1-20230612.114412-srg.jar%23323!/:?]
	at net.minecraft.client.server.IntegratedServer.m_5705_(IntegratedServer.java:89) ~[client-1.20.1-20230612.114412-srg.jar%23323!/:?]
	at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:661) ~[client-1.20.1-20230612.114412-srg.jar%23323!/:?]
	at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:251) ~[client-1.20.1-20230612.114412-srg.jar%23323!/:?]
	at java.lang.Thread.run(Thread.java:833) ~[?:?]
[19:04:24] [Server thread/FATAL]: Preparing crash report with UUID aab9b16f-880c-42b6-9f6c-4fe6f9a97364
[19:04:24] [Server thread/ERROR]: This crash report has been saved to: /Users/jaspersaccount/Documents/curseforge/minecraft/Instances/1.20.1 Forge/crash-reports/crash-2024-11-15_19.04.24-server.txt
[19:04:24] [Server thread/INFO]: Stopping server
[19:04:24] [Server thread/INFO]: Saving players
[19:04:24] [Render thread/FATAL]: Preparing crash report with UUID 85abd4fc-3ed2-41e4-968b-c8b4b3ee8479
[19:04:45] [Server thread/INFO]: Loading JourneyMap Forge Configs

Other Information

• I am using other mods besides Ice and Fire
• I have attached a log file from the session that I have experienced this issue