Equation references do not support underline

<img width="667" alt="image" src="https://github.com/user-attachments/assets/5df9fc8e-946b-4891-ae29-3a6d1b851992"> <img width="419" alt="image" src="https://github.com/user-attachments/assets/45fcb422-4403-43a6-93b1-df70fac9f02e"> Fix bug to allow underline in equation references.