Newly added flags don't show in PR previews

Discovered in #99.

This is, how the language selector looks like in PR preview mode:
<img width="1116" height="559" alt="Image" src="https://github.com/user-attachments/assets/862a5045-f043-4326-adb8-ca25b18c463b" />

And this is how it looks like after merging:
<img width="1082" height="538" alt="Image" src="https://github.com/user-attachments/assets/54a968cf-4d30-416b-a0f7-bd0593fa1804" />