Import operation halts with this erorr. A partial model or no model is imported. The project folder is filled with strange .usd / .grp files.
InvalidOperationException: Collection was modified; enumeration operation may not execute.
System.Collections.Generic.Dictionary`2+KeyCollection+Enumerator[TKey,TValue].MoveNext () (at <787acc3c9a4c471ba7d971300105af24>:0)
PipelineMeshModule
4+Mesh[TVertexData,TEdgeData,TFaceCornerData,TFaceData].AutoSmooth (PipelineMeshModule
4+AutoSmoothNormalCalculator[TVertexData,TEdgeData,TFaceCornerData,TFaceData] normalCalculator, PipelineMeshModule`4+AutoSmoothFaceCornerFactory[TVertexData,TEdgeData,TFaceCornerData,TFaceData] faceCornerFactory, System.Single angleTolerance) (at <f8f74e411e714e6b86c66f8df3b2483e>:0)
UnityImportOperations.AutoSmooth (PipelineMeshModule`4+IReadonlyMesh[TVertexData,TEdgeData,TFaceCornerData,TFaceData] mesh, System.Single angleTolerance) (at <f8f74e411e714e6b86c66f8df3b2483e>:0)
Cargo.CargoMeshFactory.ImportMesh (NETKBUSD.Kb3dInstance components, System.Collections.Generic.Dictionary`2[TKey,TValue] materials, System.String parentName, System.String importName) (at <4e04a334e690456a95c3911abeb40eee>:0)
Cargo.CargoUI.HandleCreateMeshes (System.Collections.Generic.Dictionary
2[TKey,TValue] materials, System.Collections.Generic.List
1[T] componentInstances, System.String assemblyName, System.String importName) (at <4e04a334e690456a95c3911abeb40eee>:0)
Cargo.CargoUI.HandleAssetImport (System.Collections.Generic.Dictionary
2[TKey,TValue] materials, System.Collections.Generic.List
1[T] componentInstances, System.String assemblyName, System.String importName) (at <4e04a334e690456a95c3911abeb40eee>:0)
Cargo.CargoListener.StartListener () (at <4e04a334e690456a95c3911abeb40eee>:0)
System.Threading.ThreadHelper.ThreadStart_Context (System.Object state) (at <787acc3c9a4c471ba7d971300105af24>:0)
System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) (at <787acc3c9a4c471ba7d971300105af24>:0)
System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) (at <787acc3c9a4c471ba7d971300105af24>:0)
System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state) (at <787acc3c9a4c471ba7d971300105af24>:0)
System.Threading.ThreadHelper.ThreadStart () (at <787acc3c9a4c471ba7d971300105af24>:0)
UnityEngine.<>c:<RegisterUECatcher>b__0_0(Object, UnhandledExceptionEventArgs)