ISketchSegment::SplitEntity()​ method fails when performing an in-context part editing.

I create a new 2D sketch, draw one horizontal line from (-100, 0) to (100, 0), in millimeters, and then execute the code below:

IModelDoc2 document = _iSwApp.ActiveDoc; // _iSwApp is ISldWorks object.
ISelectionMgr sm = document.SelectionManager;
ISketchSegment segment = sm.GetSelectedObject6(1, -1);
//segment.ConstructionGeometry = true; // Converting to construction line works just fine, but I'm not interested in it.
segment.SplitEntity(0.010, 0, 0, 0, 0, 0);

Three scenarios:

• Part editing, sketch belongs to the part: works fine, the line is split at 10 mm right of the origin.
• Assembly editing, sketch belongs to the assembly: works fine, the line is split at 10 mm right of the origin.
• Part in-context editing, sketch belongs to the part within an assembly: throws an exception below.

System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at modelDocSketch_c.moSketchInProgr(modelDocSketch_c* )
   at SketchCoupling.SketchToolsCoupler_c.getUoSketch()
   at SketchCoupling.SketchToolsCoupler_c.ConvertSketchToScreen(CorePoint_s sketch)
   at APICoupler.apiSplitEntityCoupler_c.populateDataPacket()
   at APICoupler.apiCoupler_c.run()
   at SolidWorks.Interop.sldworks.ISketchSegment.SplitEntity(Double X, Double Y, Double Z, Double ClosedX, Double ClosedY, Double ClosedZ)
   at WeldingPlanner.SwAddin.ShowPageAddPass() in C:\D\Local\CoRoWeld\Welding Planner\src\Welding Planner\SwAddin.cs:line 170

I am suspecting yet another bug with in-context editing.

Can anybody confirm or deny the behavior?

Using SolidWorks 2015 SP5.0