Assets are not imported again when reimported from project browser

Steps to Reproduce:

1. Create a new project.
2. Window > Asset Store.
3. Download and Import Unity Standard Assets.
4. Project Browser > Select Assets folder > Right-Click > Reimport.

Expected Result: Selected assets are Reimported.

Actual Result: Selected assets are not Reimported.

Reproducible on: 2020.1.0a4, 2019.3.0b3, 2019.3.0a1.

Working Fine on: 2019.2.6f1.

Environment: Windows 10 and Mac.

Note: Reimport All works fine.