How to reproduce:
1. Open the attached “IN-122021“ project
2. Observe the Game window. Notice that the letters “L” and “A” are connected at the baseline
3. In the Hierarchy window, select “Text (TMP)” GameObject
4. In the Inspector, in the “TextMeshPro - Text (UI)” component, change Text Input to “play lf tw”
5. Change Font Style to “Uppercase”
6. Observe the Game window

Expected result: The letters “L” and “A” are connected at the baseline
Actual result: The letters “L” and “A” are not connected at the baseline

Reproducible with: 2023.2.0a14, 6000.0.62f1, 6000.2.13f1, 6000.3.0f1, 6000.4.0a5, 6000.5.0a1
Could not test with: 2022.1.0a5, 2023.2.0a8 (The “Extra Settings” tab does not have a Font Features dropdown with the “liga” setting)

Reproducible on: macOS 15.3.2 (24D81) (M1 Max), Windows 11 (10.0.26100) X64 (Tested by the reporter)
Not reproducible on: No other environments tested

Note: Reproducible in Player