Dragging duration bar of a row that has children with duration rows starting before parent adjusts child rows' timebars incorrectly during drag past zero

Create presentation with a cube that has a child sphere. Drag the cube's timebar a couple of seconds to right. Then drag the sphere's duration bar one second to the left, so that the sphere's duration starts before parent cube's duration. Now drag the parent cube's timebar left so that sphere's start time would go beyond zero (do not release mouse yet). This adjust's the start time of sphere's timebar to keep it at zero as expected. However, if you continue to drag back to right, the old relative position is not restored until you end the drag. This causes a visual discrepancy between drag-time and final result.