List group item hover issue

Prerequisites

• I have searched for duplicate or closed issues
• I have validated any HTML to avoid common problems
• I have read the contributing guidelines

Describe the issue

Hovering over a list item seems to lose color. Not sure if it's intentional.

Reduced test cases

• https://getbootstrap.com/docs/5.1/components/list-group/#links-and-buttons (works)
• https://twbs-bootstrap.netlify.app/docs/5.1/components/list-group/#links-and-buttons (doesn't work)

What operating system(s) are you seeing the problem on?

Windows

What browser(s) are you seeing the problem on?

Firefox

What version of Bootstrap are you using?

main