How to reproduce:
1. Create a new project
2. Create a new UI Document (Assets > Create > UI Toolkit > UI Document)
3. Add a label and input the text “0a1a2a3a4a5a6a7a8a9a”
4. Import the attached fonts and create a font asset
5. Change the label text font to one of the assets
6. Observe the result

Expected result: The font shows with regular spacing
Actual result: The font shows with incorrect spacing

Reproducible with: 2023.2.0a5, 6000.0.51f1, 6000.1.7f1, 6000.2.0b5
Not reproducible with: 2022.3.63f1, 2023.2.0a4

Reproduced on: Windows 11
Not reproduced on: No other environment tested

Notes:
- Issue occurs with numbers 1 - 5, lowercase letters: a, b, f, o, and uppercase letters: E, M, N, Y, Z
- First font used will always reproduce the issue but adding another label with the other font will often not reproduce
- Restarting the project fixes the issue but will reproduce again with a new label
- The font shows normally on other GameObjects