Files in merge requests are no longer shown as renamed

Steps to reproduce

• rename and change a file
• create a merge request
• open changes tab of merge request

Example Project

https://gitlab.com/reproduction-group/merge-requests/merge_requests/12/diffs

What is the current bug behavior?

only new file name is shown:

What is the expected correct behavior?

new and old file names are shown

Possible fixes

This problem seems to be on the frontend because the JSON response contains the correct information: