Sections LESS mixins: fix the issue with missing rules and incorrect default variables#18730

magento-engcom-team merged 2 commits intomagento:2.3-developmagento/magento2:2.3-developfrom

dmytro-ch:fix/2.3-lib-sections-mixindmytro-ch/magento2:fix/2.3-lib-sections-mixinCopy head branch name to clipboard