- Create an animation track
- Create an override track for the previous Animation track
- Open the Project tab, start dragging an Animation Clip and position.
- Position the mouse cursor so that the pointer is overlapping the parent track (i.e.: not the override)
- Release

Result: in some cases, the clip is created for the overridden track instead of the parent track. We seem to be using the wrong offset.

See the gif in attachment.