How to reproduce:
1. Open the attached "UIToolkitSliderFiller.zip" project
2. Open the "TestScene"
3. Enter Play mode
4. Move the slider in the UI to both sides
5. Observe the fill of the slider
Actual result: In certain slider positions, the fill rounds off before the dragger and leaves empty space visible
Expected result: The fill always covers the entire background and does not round
Reproducible with: 6000.0.0f1, 6000.0.79f1, 6000.3.20f1, 6000.5.4f1, 6000.6.0b4, 6000.7.0a2
Reproducible on: Windows 11
Not reproducible on: No other environments tested