How to reproduce:
1. Create a new project
2. Download the com.unity.timeline package (Window > Package Manager > Unity Registry)
3. Open the Timeline window (Window > Sequencing > Timeline)
4. In the Project window, create and select a Timeline file
5. In the Timeline window, observe the Timeline Mode Icons
Actual result: Icons are blurry, distorted
Expected result: Icons are not distorted or blurry
Reproducible with: 6000.6.0a1 (b0e692525f04)
Not reproducible with: 2023.1.0a1, 6000.0.71f1, 6000.3.11f1, 6000.4.0f1, 6000.5.0a7, 6000.5.0a9
Reproducible on: Windows 11
Not reproducible on: No other environments tested