Closes #23218

Before:
<img width="1463" alt="before"
src="https://github.com/user-attachments/assets/4f77a4e0-61b8-4516-91a4-366f73e24760"
/>

After:
<img width="1463" alt="after"
src="https://github.com/user-attachments/assets/61e2c69d-fa6b-4c52-b1eb-ad7a61e274e0"
/>


Release Notes:

- Fixed issue where code block highlight and indentation in markdown
preview was rendered incorrectly.