A batch of dot-notation component names, like card.body or list-group.item, have been deprecated in favor of their dash-notation equivalents, card-body and list-group-item. Both still work, but the dash versions are now the documented, supported names and the dotted aliases will be removed in a future release.
<!-- Before --><x-card.body>...</x-card.body><!-- After --><x-card-body>...</x-card-body>
The full list of renamed components is in the 1.3.2 release notes. It's worth a scan if you're upgrading and using any of the accordion, avatar, breadcrumb, button, card or list-group components by their dotted name.