Rect Tool, Hand Tool, Rotate Tool, Move Tool, Scale Tool, Editor Tool, Grid Tool, Play/Pause button icon is not visible until click on it, Refer attached screenshot

Workaround: Enter in Play Mode, All icon appears.

Steps to repro:
1. Create a new project.
2. Click on the Hand, Rect, Move Tool button

Actual Result:
Tool con is not visible until click on the button

Expected Result:
Tool icon visible clearly

Occurring on:
2021.1.0a1

Working fine on:
2020.2.0b7, 2020.1.7f1

Environment:
Occurs only on Windows 10