How to reproduce:
1. Open the attached project
2. Build & Run on Android device
3. Click on "UIToolkit scene" button so it's gets clicked through Scrollbar
4. Click on any Input Field in the opened scene

Expected result: Keyboard shows up (repro with IMGUI and UIToolkit)
Actual result: Keyboard doesn't show up

Reproducible: 2022.1.0a13

Reproducible:
VLNQA00090, Samsung Galaxy S8 (SM-G950U), Android 7.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
Samsung Galaxy S21 Ultra (SM-G998B), Android 11, CPU: Exynos 2100, GPU: Mali-G78
Google Pixel 4, Android 12, CPU: Snapdragon 855 (SM8150), GPU: Adreno (TM) 640

Not reproducible:
iPhone 12, A14, 14.7.1

Notes:
- This only happens after initial Soft Keyboard was opened via IMGUI or UIToolkit. Works fine if it was opened with UGUI/TMP.
- Modify GUIsimple script and change Scrollbar position-> scrollViewVector = GUI.BeginScrollView (new Rect (25, 2000, 3000, 3000), scrollViewVector, new Rect (0, 0, 4000, 4000)); if scrollbar doesn't show up above button on your device
- Input Fields start working when you lock and then unlock the device or UGUI text field is clicked