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When multiple CSS classes are added to a menu item, the nav_menu_link_attributes filter should be called with $item->classes set to an array of CSS class names. When previewing in the Customizer, however, a single string was being passed to $item->classes because WP_Customize_Nav_Menu_Item_Setting::preview() bypasses wp_update_nav_menu_item() and instead uses filter_wp_get_nav_menu_items(). The fix is to make filter_wp_get_nav_menu_items() match what wp_update_nav_menu_item() does and split the string into an array. Fixes #43113. Props dlh. Built from https://develop.svn.wordpress.org/trunk@49624 git-svn-id: http://core.svn.wordpress.org/trunk@49362 1a063a9b-81f0-0310-95a4-ce76da25c4cd