How to reproduce:
1. Open the "UIToolkitTouchscreenBug.zip" project on a touchscreen computer
2. Build and run the project
3. Press Alt+Tab to focus on another application on the same screen as the Player
4. Press Alt+Tab to focus back on the Player
5. Use any UI Toolkit element through the touchscreen
6. Observe the Player

Expected results: The sliders move immediately, the radio buttons get selected immediately
Actual results: The sliders don't move, the radio buttons don't get set

Reproducible in: 1.7.0 (6000.1.0b12), 1.14.0 (2022.3.60f1, 6000.0.45f1, 6000.1.0b12, 6000.2.0a7)

Reproduced on: Windows 11 Pro (24H2), 15.3.2 (M1 Max)
Not reproduced on: No other environment tested

Notes:
- After focusing the project with the mouse cursor, the input starts working as expected
- Not reproducible with the old input system
- Moving the cursor after switching tabs will make the UI elements interactable
- If this does not reproduce on the first try, repeat steps 3-4
- Not reproducible in the Editor