When I Reshape or Split a polygon with Streaming tool, it alway waring that "new geometry must intersect the feature in at least two places", or "split failed, geometry must intersect polylines and polygons in two or more places", actually I click a polygon and then use these two tools, every time.
this situation occured more frequencyly when I move my mouse quickly, but I am sure the paths are intersected.
And sometimes, in this situation, I usually need pressing F2 twice then it fininsh successfully, press F2 once it will remind the warning above.