Animation State Transition Settings Icon is not getting clicked.

Steps to repro:
1. Open the attached project.
2. Open Cube animator.
3. Select Transition (Idle >> New State).
4. Click on the Settings icon in the inspector.

Actual Result:
Transition Settings Icon is not getting clicked.

Expected Result:
Transition Settings Icon should be clicked and opened.

Reproducible in:
2019.3.0a10, 2019.3.0a7.

Working Fine in:
2019.3.0a6, 2019.2.0b10.

Environment:
Windows & Mac.