Not  sure if any of this is useful i do apologies if it is not

*[*_21:20:16] [Spigot Watchdog Thread/ERROR]: Server thread dump (Look for plugins here before reporting to Spigot!):_
[21:20:16] [Spigot Watchdog Thread/ERROR]: ------------------------------
[21:20:16] [Spigot Watchdog Thread/ERROR]: Current Thread: Server thread
[21:20:16] [Spigot Watchdog Thread/ERROR]: PID: 38 | Suspended: false | Native: false | State: WAITING
[21:20:16] [Spigot Watchdog Thread/ERROR]: Stack:
[21:20:16] [Spigot Watchdog Thread/ERROR]: sun.misc.Unsafe.park(Native Method)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.util.concurrent.locks.LockSupport.park(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.util.concurrent.CompletableFuture$Signaller.block(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.util.concurrent.ForkJoinPool.managedBlock(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.util.concurrent.CompletableFuture.waitingGet(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.util.concurrent.CompletableFuture.join(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: net.minecraft.server.v1_16_R3.IChunkLoader.i(IChunkLoader.java:118)
[21:20:16] [Spigot Watchdog Thread/ERROR]: net.minecraft.server.v1_16_R3.PlayerChunkMap.save(PlayerChunkMap.java:373)
[21:20:16] [Spigot Watchdog Thread/ERROR]: net.minecraft.server.v1_16_R3.ChunkProviderServer.save(ChunkProviderServer.java:342)
[21:20:16] [Spigot Watchdog Thread/ERROR]: Current Thread: NonBlockingInputStreamThread
[21:20:16] [Spigot Watchdog Thread/ERROR]: PID: 41 | Suspended: false | Native: false | State: WAITING
[21:20:16] [Spigot Watchdog Thread/ERROR]: Stack:
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.lang.Object.wait(Native Method)
[21:20:16] [Spigot Watchdog Thread/ERROR]: org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.run(NonBlockingInputStream.java:278)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.lang.Thread.run(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: ------------------------------
[21:20:16] [Spigot Watchdog Thread/ERROR]: Current Thread: Snooper Timer
[21:20:16] [Spigot Watchdog Thread/ERROR]: PID: 39 | Suspended: false | Native: false | State: WAITING
[21:20:16] [Spigot Watchdog Thread/ERROR]: Stack:
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.lang.Object.wait(Native Method)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.lang.Object.wait(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.util.TimerThread.mainLoop(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.util.TimerThread.run(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: ------------------------------
[21:20:16] [Spigot Watchdog Thread/ERROR]: Current Thread: Timer hack thread
[21:20:16] [Spigot Watchdog Thread/ERROR]: PID: 30 | Suspended: false | Native: false | State: TIMED_WAITING
[21:20:16] [Spigot Watchdog Thread/ERROR]: Stack:
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.lang.Thread.sleep(Native Method)
[21:20:16] [Spigot Watchdog Thread/ERROR]: net.minecraft.server.v1_16_R3.SystemUtils$6.run(SourceFile:636)
[21:20:16] [Spigot Watchdog Thread/ERROR]: ------------------------------
[21:20:16] [Spigot Watchdog Thread/ERROR]: Current Thread: Attach Listener
[21:20:16] [Spigot Watchdog Thread/ERROR]: PID: 6 | Suspended: false | Native: false | State: RUNNABLE
[21:20:16] [Spigot Watchdog Thread/ERROR]: Stack:
[21:20:16] [Spigot Watchdog Thread/ERROR]: ------------------------------
[21:20:16] [Spigot Watchdog Thread/ERROR]: Current Thread: Signal Dispatcher
[21:20:16] [Spigot Watchdog Thread/ERROR]: PID: 5 | Suspended: false | Native: false | State: RUNNABLE
[21:20:16] [Spigot Watchdog Thread/ERROR]: Stack:
[21:20:16] [Spigot Watchdog Thread/ERROR]: ------------------------------
[21:20:16] [Spigot Watchdog Thread/ERROR]: Current Thread: Finalizer
[21:20:16] [Spigot Watchdog Thread/ERROR]: PID: 3 | Suspended: false | Native: false | State: WAITING
[21:20:16] [Spigot Watchdog Thread/ERROR]: Stack:
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.lang.Object.wait(Native Method)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.lang.ref.ReferenceQueue.remove(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.lang.ref.ReferenceQueue.remove(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: ------------------------------
[21:20:16] [Spigot Watchdog Thread/ERROR]: Current Thread: Reference Handler
[21:20:16] [Spigot Watchdog Thread/ERROR]: PID: 2 | Suspended: false | Native: false | State: WAITING
[21:20:16] [Spigot Watchdog Thread/ERROR]: Stack:
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.lang.Object.wait(Native Method)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.lang.Object.wait(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.lang.ref.Reference.tryHandlePending(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)
[21:20:16] [Spigot Watchdog Thread/ERROR]: ------------------------------