Visual glitch in the scene hierarchy view when drag&drop object to the asset folder

Repro:
1- Open scene "Untitled".
2- Select any game object that is child of 'Monster_Medium'.
3- Drag the object so that it overlaps the scene view before dropping in the project view.
4- You'll see an horizontal bar ghost remaining in the scene hierarchy.

(See attached video "Screen Recording.mov")

Reproducible: 2017.1.0b3
Not Reproducible: 5.6.0f1