Mouse cursor continuously updated on opening Simple Mesh output visual graph.

Steps to repro:
1. Open the attached project.
2. Select the Visual Effect game object.
3. Inspector > Asset Template click on Edit button.

Actual Result:
Mouse cursor continuously updated.

Expected Result:
Mouse cursor should be updated only once.

Reproducible in:
2020.2.0a5, 2020.1.0b4, 2020.1.0b1 with Package Version 8.0.1.

Working Fine:
2020.1.0a26 with Package Version 8.0.1.
2019.3.8f1 with Package Version 7.3.1, 7.1.8

Environment:
Only on Windows 10.