Hot Fix Update Bootstrap to versions 3.4.1 and 4.3.1 Fixed menu items layout in the footer when using BS4 layout. Fixed mobile nav in BS4 layout.
Hot Fix Updated Less library to include fixes for PHP 7.2 Fixed responsive dropdown menus when minimal Bootstrap 4 is enabled.
Various Bootstrap 4 issues fixed: Removed sourcemap url. Fixed header coloumn sizes. Fixed search icon alignment. Fixed WooCommerce checkout inputs. Fixed featured image alignment in archive and single. Added clearfix mixin to Bootstrap build config.