How to reproduce:
1. Open the attached "IN-98390" project
2. Open the UI Builder window
3. In the Assets folder, locate the “GamePage.uxml” Visual Tree Asset and open it inside the UI Builder window
4. Observe the UI Builder window
5. Locate and open the “GamePage.uss” file from the Assets folder in any script editing software
6. Locate the “.1v1_wager” Style Class, rename it to “.onevone_wager”
7. Observe the UI Builder window again

Expected result: UI Style is consistent between different Style Classes
Actual result: VisualElements containing Images have an inconsistent background, UI Buttons break, borders are not respected

Reproducible in: 2022.1.0a5, 2022.3.61f1, 6000.0.45f1, 6000.1.0b13, 6000.2.0a8
Could not test in: 2022.1.0a4 (Too many console errors, project does not load correctly)

Reproducible on: macOS 15.3.2 (M1), Windows 10, Windows 11
Not reproducible on: No other environments tested

Notes:

* Similar to [https://issuetracker.unity3d.com/issues/ui-builder-resets-visualelement-properties-when-file-path-contains-special-characters|https://issuetracker.unity3d.com/issues/ui-builder-resets-visualelement-properties-when-file-path-contains-special-characters|smart-link] but the issue documented there was observed and fixed regarding special characters (not digits or characters)
* Take note of the different Style Classes inside “GamePage.uss”. When the Editor is restarted multiple times in an affected version, the classes containing any digits get renamed to “*”