How to reproduce:
1. Open the attached 'project-1206532.zip' project
2. In the Project window add the folders '123' and '456' to the Favorites section
3. In one of the Project windows open the '123' folder from the Favorites section
4. In the other Project window open the '456' folder from the Favorites section
5. Drag the Sphere prefab from '123' folder to the '456' folder

Expected result: project windows do not go blank
Actual result: project windows go blank

Reproducible with: 2017.4.35f1, 2018.4.15f1, 2019.2.17f1, 2019.3.0f4, 2020.1.0a17

Full title describing the issue: Dragging an object from one Project window to another one makes both of them go blank when the objects are dragged between folders opened from the Favorites section

Note: the objects do get transferred correctly