Reproduction steps:
1. Open the attached “ASDQWE” project
2. Open the “Assets/Scenes/SampleScene.unity” Scene
3. Enter the Play Mode
4. In the Game View, Press the “New Game” Button
5. In the “New Window” Window, select the “'Cosmos ‘eksD7'“ Element
6. Press the right arrow key on the keyboard
7. Open UI Toolkit Debugger (Window > UI Toolkit > Debugger)
8. In the UI Toolkit Debugger Window, select the “Pick Element” Button
9. In the Game View select the teal-colored area
10. Observe the UI Toolkit Debugger Window

Expected result: “unity-tree-view__item-indent” has a width of 2ptx
Actual result: “unity-tree-view__item-indent” has a width of 8ptx

Reproducible with: 2022.3.6f1, 2023.1.6f1, 2023.2.0b1
Could not test with: 2021.3.29f1 (“error CS0122: 'TreeView' is inaccessible due to its protection level”)

Reproducible on: Intel macOS 13.4.1