Reproduction steps:
1. Open the attached project “UIDebuggerBug“
2. Open the Package Manager (Window>Package Manager)
3. Select the Unity Registry tab
4. Select the 2D package
5. Open the UI Toolkit Debugger (Ctrl+F5)
6. Press the button Pick Element
7. Press on the Release element (below the 2D package title)
8. Replace any value that is set to “auto” with a numeric value
Expected result: The numeric value is applied, the “px” measurement is added
Actual result: “auto” value is reassigned
Reproducible with: 2022.2.0a15, 2022.2.18f1, 2023.1.0b16, 2023.2.0a14
Not reproducible with: 2020.3.48f1, 2021.3.25f1, 2022.2.0a14
Reproducible on: Windows 11
Note: In Unity 2023.2.0a9 and above the size measurements cannot be changed unless the measurement is specified