Card component with header and list-group inside have a thick border-top

[hankir]

Card component with header and list groups inside have a thick border-top. In version 4.3 works fine.

Before opening:

• Search for duplicate or closed issues - not found
• Validate and lint any HTML to avoid common problems - valid
• Read the contributing guidelines - Done!

Bug reports must include:

• Windows 10 (ver. 2004, build 19041.329)
• Microsoft Edge (ver. 83.0.478.45)
• Test case - https://codepen.io/hankir/pen/rNxMVOj or from documentation https://getbootstrap.com/docs/4.5/components/card/#list-groups

Fast fix (but i think is wrong):
.card > .list-group {
border-top: 0 !important; /* or delete border-top: inherit */
}

Broken in #30497

[mdo]

Duplicate of #30793, fixed by #30808.

[hankir]

Thanks!