Steps to reproduce :

- import the texture attached
- set it to Sprite and Manual and apply
- open the Sprite Editor
- select Automation and Slice
- hit apply and close the Sprite Editor
- drag to sprite to the scene and press play
- while in play mode select the sprite in the Project Browser
- change it from Sprite to Texture
- press apply and notice the error in the console

Asset import did not unload metadata path. This will leak memory. File a bug with repro steps please.
UnityEditor.DockArea:OnGUI()

*Note :
Video attached.