How to reproduce:
1. Open the “Click_Mask_UGUI.zip“ project
2. Open the “Main” Scene
3. Enter Play Mode
4. In the Game View, click the top half of the red box
5. Observe the Console

Expected result: 'OnClicked: Item' appears in the Console
Actual result: 'OnClicked: Item' does not appear in the Console

Reproducible in: 2023.1.0a1, 6000.0.55f1, 6000.2.0f, 6000.3.0a4

Reproduced on: Windows 11 Pro (24H2), macOS 15.5 (24F74) (by the reporter)
Not reproduced on: No other environment tested

Notes:
- The elements are not even hoverable
- Reproducible in the Player as well