Steps to reproduce:
1. Open the attached “ScrollViewBug.zip” project
2. Open the “SampleScene”
3. Enter Play Mode
4. Click on the Scroll Bar
5. Use the arrow keys to move the Scroll Bar
6. Observe the amount of scrolling done by each keypress

Expected result: The Scroll Bar moves the same amount as pressing the up or down arrow above or below the Scroll Bar and is moved the same amount as ScrollView.verticalPageSize is set to
Actual result: The Scroll Bar moves slowly and is never influenced by ScrollView.verticalPageSize

Reproducible in: 6000.0.30f1, 6000.1.0a7
Couldn’t test in: 2022.3.53f1, 2021.3.46f1 (because versions didn't have “INotifyBindablePropertyChanged” and “UxmlElement Attribute”)

Reproducible on: Windows 11
Not reproducible on: No other environment tested