“Learn more” hyperlink disappears from the Project Preview Theme helpbox in the Project Settings window when Project Settings window Search functionality is used

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Open the Project Settings window (Edit > Project Settings)
3. Open the "UI Toolkit" tab in the Project Settings window
4. Type "Project Preview Theme" in the Project Settings Search bar
5. Observe the "Learn more" hyperlink in the Project Preview Theme Helpbox

Actual results: The "Learn more" hyperlink disappears and becomes just text

Expected results: The hyperlink does not disappear

Reproducible with versions: 6000.4.0b3, 6000.5.0a4

Can’t test with versions: 6000.0.65f1, 6000.3.3f1 (due to no Project Preview Theme section in the Project Settings)

Tested on (OS): MacOS Silicon Tahoe 26.1

Notes:

• Deleting the text from the Search bar does not fix the issue