CONTRIBUTING button show dotted line instead of solid line

Summary

CONTRIBUTING button still show dotted line instead of solid line even CONTRIBUTING.md exists.

Steps to reproduce

Add a CONTRIBUTING.md to repository.

Example Project

https://gitlab.com/gitlab-org/gitlab-ce

What is the current bug behavior?

CONTRIBUTING button show dotted line.

What is the expected correct behavior?

CONTRIBUTING button should show solid line like other buttons.

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com