Reproduction steps:
1. Create a new project
2. Make sure Use new Hierarchy window is enabled in Unity > Settings…
3. Click on Hierarchy search icon and observe search filter icons

Actual result: Some of the search filter icons appear pixelated
Expected result: All search filter icons appear sharp and clear

Reproducible with: 6000.3.2f1, 6000.4.0b1, 6000.5.0a3

Reproduced on: macOS Tahoe 26.1 (M4)