[19:16:45] [c2me-worker-4/ERROR] (class_3846) Cound not schedule mailbox
 java.util.concurrent.RejectedExecutionException: null
        at java.base/java.util.concurrent.ForkJoinPool.submissionQueue(ForkJoinPool.java:2351) ~[?:?]
        at java.base/java.util.concurrent.ForkJoinPool.poolSubmit(ForkJoinPool.java:2368) ~[?:?]
        at java.base/java.util.concurrent.ForkJoinPool.execute(ForkJoinPool.java:2847) ~[?:?]
        at MC/net.minecraft.util.thread.TaskExecutor.execute(TaskExecutor.java:135) ~[server-intermediary.jar:?]
        at MC/net.minecraft.util.thread.TaskExecutor.send(TaskExecutor.java:124) ~[server-intermediary.jar:?]
        at MC/net.minecraft.server.world.ChunkTaskPrioritySystem.enqueueChunk(ChunkTaskPrioritySystem.java:129) ~[server-intermediary.jar:?]
        at MC/net.minecraft.server.world.ChunkTaskPrioritySystem.method_17624(ChunkTaskPrioritySystem.java:95) ~[server-intermediary.jar:?]
        at MC/net.minecraft.util.thread.MessageListener$1.send(MessageListener.java:44) ~[server-intermediary.jar:?]
        at MC/net.minecraft.server.world.ServerLightingProvider.enqueue(ServerLightingProvider.java:106) ~[server-intermediary.jar:?]
        at MC/net.minecraft.server.world.ServerLightingProvider.enqueueSectionData(ServerLightingProvider.java:98) ~[server-intermediary.jar:?]
        at MC/net.minecraft.world.ChunkSerializer.deserialize(ChunkSerializer.java:139) ~[server-intermediary.jar:?]
        at com.ishland.c2me.rewrites.chunksystem.common.statuses.ReadFromDiskAsync.lambda$invokeAsyncLoad$4(ReadFromDiskAsync.java:87) ~[c2me-rewrites-chunk-system-0.3.0.222+1.21.1-530ffccaf5fb13d9.jar:?]
        at io.reactivex.rxjava3.internal.operators.single.SingleMap$MapSingleObserver.onSuccess(SingleMap.java:58) [io_reactivex_rxjava3_rxjava-3.1.8-24e07474fe6d000e.jar:?]
        at io.reactivex.rxjava3.internal.operators.single.SingleObserveOn$ObserveOnSingleObserver.run(SingleObserveOn.java:81) [io_reactivex_rxjava3_rxjava-3.1.8-24e07474fe6d000e.jar:?]
        at io.reactivex.rxjava3.internal.schedulers.ExecutorScheduler$ExecutorWorker$BooleanRunnable.run(ExecutorScheduler.java:324) [io_reactivex_rxjava3_rxjava-3.1.8-24e07474fe6d000e.jar:?]
        at com.ishland.c2me.base.common.scheduler.WrappingTask.run(WrappingTask.java:21) [c2me-base-0.3.0+alpha.0.222+1.21.1-7f66745de01397f2.jar:?]
        at com.ishland.flowsched.executor.WorkerThread.pollTasks(WorkerThread.java:57) [c2me-base-0.3.0+alpha.0.222+1.21.1-7f66745de01397f2.jar:?]
        at com.ishland.flowsched.executor.WorkerThread.run(WorkerThread.java:27) [c2me-base-0.3.0+alpha.0.222+1.21.1-7f66745de01397f2.jar:?]
        ```

**To Reproduce**
Steps to reproduce the behavior:
Shut Down the Server, 

**Expected behavior**
Shoud not throu the error on Shutting Down

**Screenshots**
<!-- If applicable, add screenshots to help explain your problem. -->

**Runtime info (please complete the following information):**
 - OS:  Windows 11
 - Minecraft version:  1.21.1


**Crash reports / logs**
https://mclo.gs/i24kSUK




**Checklist**
 - [x] I am using the official version of the mod. 
 - [x] I tried the latest development version but the issue persists. 
 - [x] I searched for similar open issues and could not find an existing bug report on this. 

**Additional context**
Could this be an issue with https://modrinth.com/mod/fabric-mail ? Don't know where it could be an mailbox?