In WebGL Player “Default Cursor” resets to system default cursor when leaving UI Document which sets a custom cursor

How to reproduce:
1. Open the user’s attached “UI Tookit theme bug.zip” project
2. Open the “SampleScene” Scene
3. Switch to WebGL platform and “Run And Build”
4. In the Player hover over the green square on the left
5. Move the cursor away from the square

Expected result: The cursor stays the same as selected in Player Settings “Default Cursor”
Actual result: The cursor becomes the system default one

Reproducible with: 2021.2.7f1, 2022.1.0b2
Could not test with: 2019.4.34f1, 2020.3.25f1 (Errors in the Console)

Notes:

• To see expected result enter the Play Mode
• Issue is not present in standalone Player
• Removing “cursor: url('project://database/Assets/Arrow.png?fileID=2800000&guid=636da000faceea041a4d58b5fd7bb2c2&type=3#Arrow');” from “theme1.uss” gives the expected result