No diff for new files

Hi, it is not possible for me to view diffs for a new file. It reports "no changes detected", and the file can not be inspected. Additionally, it then fails to generate a commit message. I have attached a screenshot.

<img width="1241" height="1004" alt="Image" src="https://github.com/user-attachments/assets/add41799-eb36-47b2-9bce-06e65d0c1f5f" />