In attachement, please find a Git repository to reproduce the issue. It has two branches, create a pull request to merge new-branch into main, this will show the issue.

There are two branches with three commits each :

• main

  • initial commit
  • a common change
  • a change on main only

• new-branch

  • initial commit
  • a common change
  • a new branch change

The only diverging commits are a change on main only and a new branch change. When creating a pull request to merge new-branch into main, it appears that the change section shows a diff of a new branch change against a common change instead of a new branch change against a change on main only.

Hence, we get something that looks like:

While we are expecting something that should look like: