After force push to default branch, old README is still displayed

Summary

When the default branch of a project has a README and gets overwritten by force push with a branch without a README, the old README is still displayed on the project page.

Steps to reproduce

• create empty project
• create README.md
• make default branch non-protected
• create new branch without README.md
• force push to default branch

What is the current bug behavior?

• old README.md is still visible on project page (https://gitlab.com/reproduction-group/readme-force-push, screenshot)
• clicking on edit icon there leads to 404 (https://gitlab.com/reproduction-group/readme-force-push/edit/master/README.md)
• repository → files does not contain README.md (https://gitlab.com/reproduction-group/readme-force-push/tree/master, screenshot)

What is the expected correct behavior?

• no README.md is displayed (https://gitlab.com/reproduction-group/no-readme, screenshot)