FTB Infinity Chunk Issue

20.04 20:23:37 [Server] WARN at java.lang.Thread.run(Unknown Source)
20.04 20:23:37 [Server] WARN at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:658)
20.04 20:23:37 [Server] WARN at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:798)
20.04 20:23:37 [Server] WARN at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:423)
20.04 20:23:37 [Server] WARN at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:920)
20.04 20:23:37 [Server] WARN at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:254)
20.04 20:23:37 [Server] WARN at net.minecraft.world.gen.ChunkProviderServer.func_73156_b(ChunkProviderServer.java:483)
20.04 20:23:37 [Server] WARN at net.minecraft.world.gen.ChunkProviderServer.func_73242_b(ChunkProviderServer.java:338)
20.04 20:23:37 [Server] WARN at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75816_a(AnvilChunkLoader.java:218)
20.04 20:23:37 [Server] WARN at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75820_a(AnvilChunkLoader.java:388)
20.04 20:23:37 [Server] WARN at java.util.HashMap$ValueIterator.next(Unknown Source)
20.04 20:23:37 [Server] WARN at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
20.04 20:23:37 [Server] WARN java.util.ConcurrentModificationException