The release 1.13 was focus on the creation of landing page components. This is the first landing page release. The next will be landing page perfect with full animation and layout.
Due to introduction of Bootstrap 5 in this release, a configuration update is require. As the bootstrap version and the stylesheet are now in the same configuration, you need after the update to set it back to your preferred stylesheet back.
New: Bootstrap 5 is now the default. Read more about the bootstrap migration on this page: ComboStrap - Release 1.13 - BootStrap 4 to 5 Migration Changes
Markup perfect means that there is no need to tweak the output via styling.