Serif font is the browser's default serif font

[Ronin546]

Expected Behavior

Please describe what should happen
The Serif font should display Source Serif Pro.

Actual Behavior

Describe what actually happens
The Serif font displays the browser's default serif font for some reason.

Steps to Reproduce

Explain what someone needs to do in order to see what's described in Actual behavior above

Steps to reproduce the behavior:

1. Go to 'Project Editor'
2. Click on 'Costumes'
3. Click on the 'Text' tool and set the font to 'Serif'
4. Type some text

System Details

If the problem occurs in the browser, please provide operating system and browser e.g. Mac OS 10.11.6 Safari 10.0
Operating system: Windows 11 25H2 build 26200.7462, Browser: Chrome 143

If using one of the Apps please provide the app version and device details, e.g. Scratch 3.0.57, Android 9 on HP x360 Chromebook

Screenshots
If applicable, add screenshots to help explain your problem.