On selecting Layers, dropdown opens and closes immediately due to which the user can not select layers from the list. It doesn't stay in opened state.

Steps To Reproduce:
1. Create a new Project
2. Select Layers.

Actual Result:
Layers dropdown opens up and closes immediately

Expected Result:
Layer dropdown opens on selecting it and various layers are selected

Occurring on:
2020.2.0a1, 2020.1.0a25, 2020.1.0a24

Working Fine on:
2020.1.0a23, 2019.3.3f1

Note: On Windows, Layers dropdown does not collapse the list after expanding it, Clicking anywhere else closes the list.
Refer to the attached video.

Workaround: Select Layer and hold the mouse key to select any Layer from the list.

Environment:
Windows10 and macOS 10.15