Issue Summary

When creating a pull request on a forked repository and selecting the parent repository as the destination, the "Create PR" page sometimes shows "Nothing has changed" in the commits section, even when there are differences between the source and destination branches.

Steps to Reproduce

1. Fork a repository
2. Make some changes in the forked repository
3. Create a pull request by selecting the parent repository as the destination
4. Sometimes the differences don't load the commits. 

• Troubleshooting Diff Display Issue - Forked Repository (Recording of issue)

Expected Results

• The diff should automatically load and displayed

Actual Results

• The message

  Nothing has changed
  This commit has no changed files to display
  

Sometimes the commits don't load in the diff. 

Workaround

• Need to refresh the page multiple times to load the diff.

OR

• Select the destination repository and select the destination branch