See the errors in the attached logfile.

2020-10-31 07:35:57.118|Main Thread> Exception occurred: System.ArgumentNullException: Value cannot be null.
Parameter name: child
   at VRage.Scene.MyTieredComponentGroup`2.GetParent(TChildComponent child)
   at VRage.Components.Physics.MyPhysicsConstraintGroup.OnActivate()
   at VRage.Scene.MyGroup.Activate()
   at VRage.Scene.MyScene.Merge(MyScene source, Boolean destroyConflicting)
   at Medieval.World.Persistence.MyEntityGridDatabase.ObjectLoader.ProcessWork()
   at Medieval.World.Persistence.MyEntityGridDatabase.Update()
   at Medieval.World.Persistence.MyInfiniteWorldPersistence.UpdateChunks(Int64 ticks)
   at VRage.Components.MyUpdateScheduler.RunTimedUpdates()
   at VRage.Components.MyUpdateScheduler.RunUpdates(TimeSpan currentTime)
   at Sandbox.Game.World.MySession.UpdateComponents()
   at Sandbox.Game.World.MySession.Update(MyTimeSpan updateTime)
   at Sandbox.MySandboxGame.Update()
   at Sandbox.Engine.Platform.Game.UpdateInternal()
   at Sandbox.Engine.Platform.Game.RunSingleFrame()
   at VRage.Components.MyUpdateScheduler.RunFixedUpdates()
   at VRage.Components.MyUpdateScheduler.RunUpdates(TimeSpan currentTime)
   at Sandbox.Engine.Platform.MySandboxUpdate.<RunLoop>b__18_0()
   at VRage.Utils.FixedLoop.Run(Action tickCallback)
   at Sandbox.Engine.Platform.MySandboxUpdate.RunLoop()
   at VRage.Dedicated.DedicatedServer`1.RunInternal()
   at VRage.Dedicated.DedicatedServer`1.RunMain(String instanceName, String customPath, Boolean isService, Boolean showConsole)