Grouping open windows by app removes underscores(_) in title

While grouping windows by application, the mate-panel shows the title without underscores. I am using MATE Desktop Environment 1.26.2
I tried changing the font family of the panel and title, but doesn't seem to fix the behavior. 

<img width="262" height="209" alt="Image" src="https://github.com/user-attachments/assets/90a09ce1-8905-414d-b25e-118118183aed" />