Entity cleanup is sometimes denied for being async

[burdoto]

Exception:

[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: java.util.ConcurrentModificationException: Async entity unload
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at net.minecraft.class_3898.handler$bef000$c2me-fixes-general-threading-issues$preventAsyncEntityUnload(class_3898.java:12435)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at net.minecraft.class_3898.method_18716(class_3898.java)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at net.minecraft.class_3215.method_18753(class_3215.java:480)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at net.minecraft.class_3218$class_5526.method_31437(class_3218.java:1581)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at net.minecraft.class_3218$class_5526.method_31797(class_3218.java:1536)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at net.minecraft.class_5579.method_31850(class_5579.java:220)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at net.minecraft.class_5579$class_5580.method_31750(class_5579.java:115)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at dev.architectury.hooks.level.entity.fabric.EntityHooksImpl$1.method_31750(EntityHooksImpl.java:48)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at net.minecraft.class_1297.method_31745(class_1297.java:3636)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at net.minecraft.class_1297.method_5650(class_1297.java:402)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at net.minecraft.class_1297.method_5768(class_1297.java:373)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at com.ampznetwork.lagmod.fabric.StandaloneCleanupCycler.cleanupItems(StandaloneCleanupCycler.java:65)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
[08:05:24] [pool-5-thread-1/INFO]: [STDERR]: 	at java.base/java.lang.Thread.run(Thread.java:1583)