How to reproduce:
1. Open the “Unity Bugs.zip“ project
2. Build and run the project
3. Scroll up and down on the ScrollView on the right
4. Observe the items of the ScrollView

Expected result: The items are masked correctly
Actual result: The items are not masked at all

Reproducible in: 2023.1.0a4, 6000.0.62f1, 6000.2.13f1, 6000.3.0f1, 6000.4.0a5, 6000.5.0a1

Reproduced on: Windows 11 Pro (24H2), macOS 15.6.1 (by the reporter)
Not reproduced on: No other environment tested

Notes:
- Reproducible in Player and Editor
- Reproduces only on the items that have been hovered on (where overrideSorting was enabled)