Breadcrumbs list overflow on compare with sha1 on mobile

Summary

Breadcrumbs list overflow on compare with sha1 on a narrow-width device (mobile).

Steps to reproduce

See gitlab-foss@85bc7844...29d8179b on a narrow-width device.

What is the current bug behavior?

ul.breadcrumbs-list element is overflown.

What is the expected correct behavior?

ul.breadcrumbs-list element can be scrollable.

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com (11.5.0-rc10-ee and 13.0.0-pre at least).

Possible fixes

Modify CSS.