Reproduction steps:
1. Open the attached "CSS" project
2. Open the “Assets/Document.uxml” file
3. In the UI Builder Hierarchy window, click the “One” VisualElement
4. In the Inspector window, click the drop-down arrow next to Spacing
5. Click the drop-down arrow next to Padding
6. Observe the “1px 2px 3px 4px” Padding values
Expected result: Values are assigned the same way they are documented in the USS property documentation “Top: 1px, Right: 2px, Bottom: 3px, Left: 4px”
Actual result: Values are assigned “Left: 1 px, Right: 2px, Top: 3px, Bottom: 4px”
Reproducible with: 2021.3.29f1, 2022.3.6f1, 2023.1.6f1, 2023.2.0b2
Reproducible on: macOS Ventura 13.4.1 (M1 Max)
Note: In Unity version 2021.3.29f1, 2022.3.6f1, 2023.1.6f1 step 5. the “Spacing” name is “Margin & Padding”.