Some further clues! I can't quite tell where the issue is coming from yet, but perhaps a mod conflict. I'll test now with a fresh world and no Mods to see if the issue persists. Here's the error on saving from the log
2023-08-09 19:52:48.146 - Thread: 1 -> Autosave initiated
2023-08-09 19:52:48.146 - Thread: 1 -> Character state: True
2023-08-09 19:52:48.146 - Thread: 1 -> IsServer: True
2023-08-09 19:52:48.146 - Thread: 1 -> MyAsyncSaving.InProgress: False
2023-08-09 19:52:48.146 - Thread: 1 -> Autosave
2023-08-09 19:52:48.148 - Thread: 1 -> Saving world - START
2023-08-09 19:52:48.148 - Thread: 1 -> Making world state snapshot.
2023-08-09 19:52:48.148 - Thread: 1 -> Before snapshot.: GC Memory: 573 B
2023-08-09 19:52:48.173 - Thread: 1 -> After snapshot.: GC Memory: 570 B
2023-08-09 19:52:48.180 - Thread: 1 -> Exception occurred: System.IO.FileNotFoundException: Unable to find the specified file.
at Sandbox.ModAPI.MyAPIUtilities.VRage.Game.ModAPI.IMyUtilities.WriteFileInWorldStorage(String file, Type callingType)
at Sisk.Utils.Logging.DefaultHandler.WorldStorageHandler.Flush()
at Sisk.Utils.Logging.Logger.Flush()
at Sisk.SmartRotors.Mod.SaveData()
at Sandbox.Game.World.MySession.SaveDataComponents()
at Sandbox.Game.World.MySession.Save(MySessionSnapshot& snapshot, String customSaveName, Action`1 progress)
2023-08-09 19:52:48.189 - 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.Game.World.MySession.Update(MyTimeSpan updateTime)
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 VRage.Dedicated.DedicatedServer.RunInternal(String instanceName)
at VRage.Dedicated.DedicatedServer.RunMain(String instanceName, String customPath, Boolean isService, Boolean showConsole, Boolean checkAlive)
at VRage.Dedicated.DedicatedServer.ProcessArgs(String[] args)
at VRage.Dedicated.DedicatedServer.Run(String[] args, Action`1 initializeServices)
at SpaceEngineersDedicated.MyProgram.Main(String[] args)
2023-08-09 19:53:09.947 - Thread: 1 -> GC Memory: 572.8447 / 572.8447 MB
2023-08-09 19:53:21.830 - Thread: 1 -> STATISTICS LEGEND,time,ReceivedPerSecond,SentPerSecond,PeakReceivedPerSecond,PeakSentPerSecond,OverallReceived,OverallSent,CPULoadSmooth,ThreadLoadSmooth,GetOnlinePlayerCount,Ping,GCMemoryUsed,ProcessMemory,PCUBuilt,PCU,GridsCount,RenderCPULoadSmooth,RenderGPULoadSmooth,HardwareCPULoad,HardwareAvailableMemory,FrameTime,LowSimQuality,FrameTimeLimit,FrameTimeCPU,FrameTimeGPU,CPULoadLimit,TrackedMemory,GCMemoryAllocated,PersistedEncounters,EncounterEntities, DRS
2023-08-09 19:53:21.830 - Thread: 1 -> STATISTICS,180.05,0.009013176,0.005992889,0.02133179,0.07242203,1.441323,1.202894,7.423535,0.3809429,2,0,571.5336,2896.844,3025,297023,3,0,0,0,0,0,0,16.66667,0,0,100,1759285508,571.5336,0,0,-1
2023-08-09 19:53:21.830 - Thread: 1 -> MEMORY LEGEND,Srv,Uav,Read,Debug,Index,Audio,SrvUav,Vertex,Buffers,Physics,Planets,Systems,Textures,Indirect,Constant,RwTextures,Dx11Render,MeshBuffers,FileTextures,DepthStencil,TileTextures,Voxels-Native,CustomTextures,HeightmapFaces,Mesh GPU Buffers,BitStreamBuffers,GeneratedTextures,FileArrayTextures,NativeDictionaries,CubemapDataBuffers,HeightDetailTexture,MyDeviceWriteBuffers,ShadowCascadesStatsBuffers,AI_PathFinding,EpicOnlineServices,EpicOnlineServicesWrapper
2023-08-09 19:53:21.830 - Thread: 1 -> MEMORY VALUES,0,0,0,0,0,0,0,0,0,77,841,1677,0,0,0,0,0,0,0,0,0,0,0,384,0,0,0,0,758,456,0,0,0,0,0,0
2023-08-09 19:53:39.947 - Thread: 1 -> GC Memory: 571.4998 / 571.4998 MB