Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/Scenes/SampleScene.unity” Scene
3. Enter the Play Mode
4. Observe the Asian language characters

Expected result: Underline and strikethrough lines appear the same as the primary font
Actual result: Thick lines and wrong placement of the underline and strikethrough

Reproducible with: 3.0.6 (2021.3.29f1, 2022.3.7f1, 2023.1.9f1)
Could not test with: UGUI 3.0.0-exp.3 (2023.2.0b5) (Custom font being rendered in triangles or not being rendered at all)

Reproducible on: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested

Notes:
- The text only reacts to changes in the "underline thickness" and "underline offset" of the primary font, not the fallback font
- A single connected series of non-whitespace characters from both primary font and fallback font will get the same underlining, as that of the fallback font, whereas this doesn't happen for separated words