Exiting end portal after killing the ender dragon crashes my multiplayer server

Exiting end portal after killing the enderdragon crashes my multiplayer server, gives me the error "Server Connection timed out". Additionally the dragons wing animation is broken, seems flap very fast and i believe his behaviour when landing in the middle of the map during the boss fight is also broken , doesn't breathe fire and just lands there still then leaves). I tried fighting him in Solo player mode. i was able to exit the end and teleport to spawn. However in Solo player wings are stil bugged. 

19w09a\: [^crash-2019-03-09_03.33.49-server.txt]

---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 09/03/19 3:33 AM
Description: Watching Server

java.lang.Error
	at java.lang.Thread.yield(Native Method)
	at ut.b(SourceFile:113)
	at ut.a(SourceFile:97)
	at bdf.a(SourceFile:200)
	at bdi.a(SourceFile:98)
	at bdf.c(SourceFile:195)
	at bdf.b_(SourceFile:411)
	at bdf.a(SourceFile:782)
	at ahm.aB(SourceFile:1098)
	at ahm.aa(SourceFile:437)
	at ahv.aa(SourceFile:272)
	at ahm.h(SourceFile:391)
	at ahv.h(SourceFile:1953)
	at arz.h(SourceFile:262)
	at uw.i(SourceFile:378)
	at vn.b(SourceFile:192)
	at iw.a(SourceFile:243)
	at vm.c(SourceFile:171)
	at net.minecraft.server.MinecraftServer.b(SourceFile:852)
	at tw.b(SourceFile:342)
	at net.minecraft.server.MinecraftServer.a(SourceFile:776)
	at net.minecraft.server.MinecraftServer.run(SourceFile:634)
	at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Server Watchdog
Stacktrace:
	at java.lang.Thread.yield(Native Method)
	at ut.b(SourceFile:113)
	at ut.a(SourceFile:97)
	at bdf.a(SourceFile:200)
	at bdi.a(SourceFile:98)
	at bdf.c(SourceFile:195)
	at bdf.b_(SourceFile:411)
	at bdf.a(SourceFile:782)
	at ahm.aB(SourceFile:1098)
	at ahm.aa(SourceFile:437)
	at ahv.aa(SourceFile:272)
	at ahm.h(SourceFile:391)
	at ahv.h(SourceFile:1953)
	at arz.h(SourceFile:262)
	at uw.i(SourceFile:378)
	at vn.b(SourceFile:192)
	at iw.a(SourceFile:243)
	at vm.c(SourceFile:171)
	at net.minecraft.server.MinecraftServer.b(SourceFile:852)
	at tw.b(SourceFile:342)
	at net.minecraft.server.MinecraftServer.a(SourceFile:776)

-- Thread Dump --
Details:
	Threads: "Netty Server IO #5" Id=46 BLOCKED on java.util.Collections$SynchronizedRandomAccessList@37827393 owned by "Server thread" Id=22
	at java.util.Collections$SynchronizedCollection.add(Unknown Source)
	-  blocked on java.util.Collections$SynchronizedRandomAccessList@37827393
	at vm$1.initChannel(SourceFile:106)
	at io.netty.channel.ChannelInitializer.initChannel(ChannelInitializer.java:113)
	at io.netty.channel.ChannelInitializer.handlerAdded(ChannelInitializer.java:105)
	at io.netty.channel.DefaultChannelPipeline.callHandlerAdded0(DefaultChannelPipeline.java:637)
	at io.netty.channel.DefaultChannelPipeline.access$000(DefaultChannelPipeline.java:46)
	at io.netty.channel.DefaultChannelPipeline$PendingHandlerAddedTask.execute(DefaultChannelPipeline.java:1487)
	at io.netty.channel.DefaultChannelPipeline.callHandlerAddedForAllHandlers(DefaultChannelPipeline.java:1161)
	...


"Netty Server IO #4" Id=45 BLOCKED on java.util.Collections$SynchronizedRandomAccessList@37827393 owned by "Server thread" Id=22
	at java.util.Collections$SynchronizedCollection.add(Unknown Source)
	-  blocked on java.util.Collections$SynchronizedRandomAccessList@37827393
	at vm$1.initChannel(SourceFile:106)
	at io.netty.channel.ChannelInitializer.initChannel(ChannelInitializer.java:113)
	at io.netty.channel.ChannelInitializer.handlerAdded(ChannelInitializer.java:105)
	at io.netty.channel.DefaultChannelPipeline.callHandlerAdded0(DefaultChannelPipeline.java:637)
	at io.netty.channel.DefaultChannelPipeline.access$000(DefaultChannelPipeline.java:46)
	at io.netty.channel.DefaultChannelPipeline$PendingHandlerAddedTask.execute(DefaultChannelPipeline.java:1487)
	at io.netty.channel.DefaultChannelPipeline.callHandlerAddedForAllHandlers(DefaultChannelPipeline.java:1161)
	...


"Netty Server IO #3" Id=44 BLOCKED on java.util.Collections$SynchronizedRandomAccessList@37827393 owned by "Server thread" Id=22
	at java.util.Collections$SynchronizedCollection.add(Unknown Source)
	-  blocked on java.util.Collections$SynchronizedRandomAccessList@37827393
	at vm$1.initChannel(SourceFile:106)
	at io.netty.channel.ChannelInitializer.initChannel(ChannelInitializer.java:113)
	at io.netty.channel.ChannelInitializer.handlerAdded(ChannelInitializer.java:105)
	at io.netty.channel.DefaultChannelPipeline.callHandlerAdded0(DefaultChannelPipeline.java:637)
	at io.netty.channel.DefaultChannelPipeline.access$000(DefaultChannelPipeline.java:46)
	at io.netty.channel.DefaultChannelPipeline$PendingHandlerAddedTask.execute(DefaultChannelPipeline.java:1487)
	at io.netty.channel.DefaultChannelPipeline.callHandlerAddedForAllHandlers(DefaultChannelPipeline.java:1161)
	...


"Netty Server IO #2" Id=40 RUNNABLE (in native)
	at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
	at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source)
	at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source)
	at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
	-  locked io.netty.channel.nio.SelectedSelectionKeySet@39459b13
	-  locked java.util.Collections$UnmodifiableSet@3d7a18e3
	-  locked sun.nio.ch.WindowsSelectorImpl@78789128
	at sun.nio.ch.SelectorImpl.select(Unknown Source)
	at io.netty.channel.nio.SelectedSelectionKeySetSelector.select(SelectedSelectionKeySetSelector.java:62)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:756)
	...


"Netty Server IO #1" Id=39 RUNNABLE
	at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
	at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source)
	at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source)
	at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
	-  locked io.netty.channel.nio.SelectedSelectionKeySet@5cc26b5f
	-  locked java.util.Collections$UnmodifiableSet@494aeed7
	-  locked sun.nio.ch.WindowsSelectorImpl@241a4a1d
	at sun.nio.ch.SelectorImpl.select(Unknown Source)
	at io.netty.channel.nio.SelectedSelectionKeySetSelector.select(SelectedSelectionKeySetSelector.java:62)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:756)
	...


"Server Watchdog" Id=38 RUNNABLE
	at sun.management.ThreadImpl.dumpThreads0(Native Method)
	at sun.management.ThreadImpl.dumpAllThreads(Unknown Source)
	at tz.run(SourceFile:45)
	at java.lang.Thread.run(Unknown Source)


"Netty Server IO #0" Id=37 RUNNABLE (in native)
	at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
	at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source)
	at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source)
	at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
	at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
	-  locked io.netty.channel.nio.SelectedSelectionKeySet@18576e67
	-  locked java.util.Collections$UnmodifiableSet@570076a1
	-  locked sun.nio.ch.WindowsSelectorImpl@49a216c0
	at sun.nio.ch.SelectorImpl.select(Unknown Source)
	at io.netty.channel.nio.SelectedSelectionKeySetSelector.select(SelectedSelectionKeySetSelector.java:62)
	at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:756)
	...


"ObjectCleanerThread" Id=36 TIMED_WAITING on java.lang.ref.ReferenceQueue$Lock@3f1ee74b
	at java.lang.Object.wait(Native Method)
	-  waiting on java.lang.ref.ReferenceQueue$Lock@3f1ee74b
	at java.lang.ref.ReferenceQueue.remove(Unknown Source)
	at io.netty.util.internal.ObjectCleaner$1.run(ObjectCleaner.java:54)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.lang.Thread.run(Unknown Source)


"D3D Screen Updater" Id=35 TIMED_WAITING on java.lang.Object@1c199299
	at java.lang.Object.wait(Native Method)
	-  waiting on java.lang.Object@1c199299
	at sun.java2d.d3d.D3DScreenUpdateManager.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)


"DestroyJavaVM" Id=33 RUNNABLE


"Server thread" Id=22 RUNNABLE
	at java.lang.Thread.yield(Native Method)
	at ut.b(SourceFile:113)
	at ut.a(SourceFile:97)
	at bdf.a(SourceFile:200)
	at bdi.a(SourceFile:98)
	at bdf.c(SourceFile:195)
	at bdf.b_(SourceFile:411)
	at bdf.a(SourceFile:782)
	...


"Thread-3" Id=29 WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@48f85ac5
	at sun.misc.Unsafe.park(Native Method)
	-  waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@48f85ac5
	at java.util.concurrent.locks.LockSupport.park(Unknown Source)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
	at java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
	at com.mojang.util.QueueLogAppender.getNextLogEvent(QueueLogAppender.java:77)
	at uc.a(SourceFile:137)
	at uc$$Lambda$1909/320318508.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)


"TimerQueue" Id=30 TIMED_WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@59d9d8de
	at sun.misc.Unsafe.park(Native Method)
	-  waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@59d9d8de
	at java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source)
	at java.util.concurrent.DelayQueue.take(Unknown Source)
	at javax.swing.TimerQueue.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

	Number of locked synchronizers = 1
	- java.util.concurrent.locks.ReentrantLock$NonfairSync@1135510c


"AWT-EventQueue-0" Id=28 RUNNABLE
	at java.security.AccessController.getStackAccessControlContext(Native Method)
	at java.security.AccessController.getContext(Unknown Source)
	at javax.swing.RepaintManager.validateInvalidComponents(Unknown Source)
	at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$500(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	...


"AWT-Windows" Id=26 RUNNABLE (in native)
	at sun.awt.windows.WToolkit.eventLoop(Native Method)
	at sun.awt.windows.WToolkit.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)


"AWT-Shutdown" Id=25 WAITING on java.lang.Object@9840426
	at java.lang.Object.wait(Native Method)
	-  waiting on java.lang.Object@9840426
	at java.lang.Object.wait(Unknown Source)
	at sun.awt.AWTAutoShutdown.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)


"Java2D Disposer" Id=24 WAITING on java.lang.ref.ReferenceQueue$Lock@32049a1
	at java.lang.Object.wait(Native Method)
	-  waiting on java.lang.ref.ReferenceQueue$Lock@32049a1
	at java.lang.ref.ReferenceQueue.remove(Unknown Source)
	at java.lang.ref.ReferenceQueue.remove(Unknown Source)
	at sun.java2d.Disposer.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)


"Server Infinisleeper" Id=23 TIMED_WAITING
	at java.lang.Thread.sleep(Native Method)
	at tw$1.run(SourceFile:92)


"Snooper Timer" Id=21 WAITING on java.util.TaskQueue@38a6c5f8
	at java.lang.Object.wait(Native Method)
	-  waiting on java.util.TaskQueue@38a6c5f8
	at java.lang.Object.wait(Unknown Source)
	at java.util.TimerThread.mainLoop(Unknown Source)
	at java.util.TimerThread.run(Unknown Source)


"Attach Listener" Id=5 RUNNABLE


"Signal Dispatcher" Id=4 RUNNABLE


"Finalizer" Id=3 WAITING on java.lang.ref.ReferenceQueue$Lock@2f2ef51a
	at java.lang.Object.wait(Native Method)
	-  waiting on java.lang.ref.ReferenceQueue$Lock@2f2ef51a
	at java.lang.ref.ReferenceQueue.remove(Unknown Source)
	at java.lang.ref.ReferenceQueue.remove(Unknown Source)
	at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)


"Reference Handler" Id=2 WAITING on java.lang.ref.Reference$Lock@62271ed
	at java.lang.Object.wait(Native Method)
	-  waiting on java.lang.ref.Reference$Lock@62271ed
	at java.lang.Object.wait(Unknown Source)
	at java.lang.ref.Reference.tryHandlePending(Unknown Source)
	at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)



Stacktrace:
	at tz.run(SourceFile:61)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 19w09a
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_201, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 566551416 bytes (540 MB) / 2320498688 bytes (2213 MB) up to 3810525184 bytes (3634 MB)
	JVM Flags: 0 total; 
	Player Count: 1 / 20; [uw['TitanoMachine'/215, l='world', x=2.28, y=60.77, z=-0.51]]
	Data Packs: vanilla
	Is Modded: Unknown (can't tell)
	Type: Dedicated Server (map_server.txt)