I'm having similar issues consistently.

2021-07-21 00:11:54.529 - Thread: 1 -> Modular Encounters Spawner: Spawning Group - [ICOR]-Refueling-Station-Asteroid-1
2021-07-21 00:11:54.694 - Thread: 9 -> Initialized large grid [ICOR]-Refueling-Station 11441 PCU
2021-07-21 00:12:04.181 - Thread: 1 -> Exception occurred: System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
at Sandbox.Game.World.Generator.MyCompositeShapeProviderBase.ReadContentRange(MyStorageData target, Vector3I& writeOffset, Int32 lodIndex, Vector3I& minInLod, Vector3I& maxInLod, Boolean detectOnly)
at Sandbox.Engine.Voxels.MyProviderLeaf.Sandbox.Engine.Voxels.IMyOctreeLeafNode.GetFilteredValue()
at Sandbox.Engine.Voxels.MyOctreeStorage.DeleteRangeOps.LeafOp[TThis](TraverseArgs`1& args, MyCellCoord& coord, Byte defaultData, MyOctreeNode& node)
at Sandbox.Engine.Voxels.MyOctreeStorage.Traverse[TOps](TraverseArgs`1& args, Byte defaultData, Int32 lodIdx, Vector3I lodCoord)
at Sandbox.Engine.Voxels.MyOctreeStorage.Traverse[TOps](TraverseArgs`1& args, Byte defaultData, Int32 lodIdx, Vector3I lodCoord)
at Sandbox.Engine.Voxels.MyOctreeStorage.Traverse[TOps](TraverseArgs`1& args, Byte defaultData, Int32 lodIdx, Vector3I lodCoord)
at Sandbox.Engine.Voxels.MyOctreeStorage.Traverse[TOps](TraverseArgs`1& args, Byte defaultData, Int32 lodIdx, Vector3I lodCoord)
at Sandbox.Engine.Voxels.MyOctreeStorage.Traverse[TOps](TraverseArgs`1& args, Byte defaultData, Int32 lodIdx, Vector3I lodCoord)
at Sandbox.Engine.Voxels.MyOctreeStorage.DeleteRangeInternal(MyStorageDataTypeFlags dataToDelete, Vector3I& voxelRangeMin, Vector3I& voxelRangeMax)
at Sandbox.Engine.Voxels.MyStorageBase.DeleteRange(MyStorageDataTypeFlags dataToDelete, Vector3I voxelRangeMin, Vector3I voxelRangeMax, Boolean notify)
at Sandbox.Engine.Voxels.MyStorageBase.AccessDelete(Vector3I& coord, MyStorageDataTypeFlags dataType, Boolean notify)
at Sandbox.Game.Entities.MyVoxelBase.RevertVoxelAccess(Vector3I key, MyStorageDataTypeFlags flags)
at Sandbox.Game.Entities.MyVoxelBase.RevertVoxelAccess<>VRageMath_Vector3I#VRage_Voxels_MyStorageDataTypeFlags.Invoke(MyVoxelBase& this, Vector3I& key, MyStorageDataTypeFlags& flags, DBNull& arg3, DBNull& arg4, DBNull& arg5, DBNull& arg6)
at VRage.Network.MyReplicationLayerBase.InvokeLocally[T1,T2,T3,T4,T5,T6,T7](CallSite`7 site, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7)
at VRage.Network.MyReplicationLayer.DispatchEvent[T1,T2,T3,T4,T5,T6,T7,T8](CallSite callSite, EndpointId recipient, Nullable`1 position, T1& arg1, T2& arg2, T3& arg3, T4& arg4, T5& arg5, T6& arg6, T7& arg7, T8& arg8)
at VRage.Network.MyReplicationLayerBase.RaiseEvent[T1,T2,T3,T4](T1 arg1, T4 arg4, Func`2 action, T2 arg2, T3 arg3, EndpointId endpointId, Nullable`1 position)
at Sandbox.Game.SessionComponents.MySessionComponentTrash.<>c__DisplayClass51_0.<VoxelReversion>b__1()
at ParallelTasks.Parallel.RunCallbacks()
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)
2021-07-21 00:12:04.182 - Thread: 1 -> Showing message
2021-07-21 00:12:04.795 - Thread: 1 ->
================================== CRASH INFO ==================================
AppVersion: 01_198_033
GameName: Space Engineers
IsOutOfMemory: False
IsGPU: False
IsNative: False
IsTask: False
IsExperimental: True
ProcessRunTime: 9940
PCUCount: 985115
IsHang: False
GCMemory: 3946
GCMemoryAllocated: 3946
HWAvailableMemory: 0
ProcessPrivateMemory: 7896
AnalyticId: SEDS