All worlds failing to save after "Warfare Evolution" update.

Any time I try to save any world, new or old since the last update, I receive this message:

World '-----------' failed to save. This can be caused by running out of memory or problems when writing files. Working on this world any longer may result in a loss of progress. You can check the log file to learn more about what caused this error.

Here is the pertinent section of the log file:

2023-09-01 11:04:59.119 - Thread: 1 -> Saving world - START

2023-09-01 11:04:59.119 - Thread: 1 -> Making world state snapshot.

2023-09-01 11:04:59.119 - Thread: 1 -> Before snapshot.: GC Memory: 1,434 B

2023-09-01 11:04:59.121 - Thread: 1 -> Exception occurred: System.NullReferenceException: Object reference not set to an instance of an object.

at Sandbox.Game.World.MySession.<>c__DisplayClass647_1.<GatherVicinityInformation>b__0()

at System.DelegateExtensions.InvokeIfNotNull(Action handler)

at Sandbox.Game.World.MySession.GatherVicinityInformation(BoundingSphereD bs, HashSet`1 voxelMaterials, HashSet`1 models, HashSet`1 armorModels, Action completion)

at Sandbox.Game.World.MySession.GatherVicinityInformation(MyObjectBuilder_Checkpoint checkpoint)

at Sandbox.Game.World.MySession.Save(MySessionSnapshot& snapshot, String customSaveName, Action`1 progress)

2023-09-01 11:04:59.122 - Thread: 1 -> OnSnapshotDone: failed to save the world at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)

at System.Environment.get_StackTrace()

at Sandbox.Game.Screens.Helpers.MyAsyncSaving.OnSnapshotDone(Boolean snapshotSuccess, MySessionSnapshot snapshot)

at Sandbox.Game.Screens.Helpers.MyAsyncSaving.Start(Action callbackOnFinished, String customName)

at Sandbox.Graphics.GUI.MyGuiScreenMessageBox.CallResultCallback(ResultEnum val)

at Sandbox.Graphics.GUI.MyGuiScreenMessageBox.OnClick(ResultEnum result)

at System.DelegateExtensions.InvokeIfNotNull[T1](Action`1 handler, T1 arg1)

at Sandbox.Graphics.GUI.MyGuiControlButton.HandleInput()

at Sandbox.Graphics.GUI.MyGuiScreenBase.HandleControlsInput(Boolean receivedFocusInThisUpdate)

at Sandbox.Graphics.GUI.MyGuiScreenBase.HandleInput(Boolean receivedFocusInThisUpdate)

at Sandbox.Graphics.GUI.MyGuiScreenMessageBox.HandleInput(Boolean receivedFocusInThisUpdate)

at Sandbox.Graphics.GUI.MyScreenManager.HandleInput()

at Sandbox.Graphics.GUI.MyDX9Gui.HandleInput()

at Sandbox.MySandboxGame.Update()

at Sandbox.Engine.Platform.Game.UpdateInternal()

at Sandbox.Engine.Platform.Game.RunSingleFrame()

at Sandbox.Engine.Platform.FixedLoop.<>c__DisplayClass11_0.<Run>b__0()

at Sandbox.Engine.Platform.GenericLoop.Run(VoidAction tickCallback)

at Sandbox.Engine.Platform.Game.RunLoop()

at Sandbox.MySandboxGame.Run(Boolean customRenderLoop, Action disposeSplashScreen)

at SpaceEngineers.MyProgram.Main(String[] args)

The full log file is attached if necessary.