UIToolkit PointerMoveEvent is called twice and returns two different delta values on the same frame

How to reproduce:
1. Open the user attached project (PointerYRepro.zip)
2. Open the SampleScene
3. Enter Play Mode
4. Move the mouse cursor in the Game view
5. Observe the MouseMoveEvent values displayed at the top left of the Game view

Expected result: there is only one event description with the correct mouse delta values for the cursor movement that was performed
Actual result: there are two event descriptions with the first one always showing negative Y values regardless of the performed cursor movement

Reproducible with: 2020.3.35f1, 2021.3.3f1, 2022.1.2f1, 2022.2.0a15
Couldn't test with: 2019.4.39f1 (unable to add the UIToolkit package)

Reproducible on: Ubuntu 20.04
Not reproducible on: Windows 10

Note: not reproducible on a standalone build