Using Grid Visibility toggle button in the scene view to change the grid axis leads to the Grid Opacity setting's Input Field getting highlighted and validating inputs.
Refer to the attached Video.

Steps to Reproduce:
Create a New Project
Scene > Toggle Grid Visibility > Dropdown > Grid Axis > X/Y/Z

Actual Result:
Grid Opacity's input field gets highlighted and accepts inputs

Expected Result:
Only Grid Axis should change according to the axis selected

Occurring On:
2020.1.0a24, 2020.1.0a16

Working Fine on:
2020.1.0a15, 2019.3.3f1

Environment:
Windows 10 and macOS 10.14, 10.15