If you search the asset store in Project View, select any result and then use the keyboard to start scrolling through the results, the first time you press a key the blue highlight will disappear from the selected asset. Only seems to happen the first time you search and scroll through results in a session.

1. Open Unity
2. Create a new project with any settings
3. In Project View, search for "horse" in the asset store
4. Select the top result with the mouse
5. Press down on the keyboard to scroll

Expected Result:
The next asset down is selected and highlighted.

Actual Result:
The highlight disappears from the Project View and the next item is not selected.

Tested on Windows 10.

Occurs on 2020.1.0a15, 2019.3.0f1, 2019.2.30f1, 2018.4.0f1, 2017.4.30f1