While looking at a merge request, on the Changes tab, not all of the changed files are listed. You can go to the Commits tab and select a commit and see the missing file and see its changes.
Basically, a branch was made several days ago, changes where made and a merge request made. Some changes were made after the merge request was made. Not sure that is relevant, but it is how I know about a new change that is not showing up. When reviewing the request and using the changes tab, we expect to see all the changes that would be merged. Using the commits tab, we can see the commit and see the file listed and its changes. But not on the changes tab from the merge request.
Any guidance or suggestions is very much appreciated.