Shortcode in WYSIWYG type

That's correct. The field doesn't apply any filters to make shortcode runs. The filter the_content does that. But you might want to use just do_shortcode() function as the_content often triggers some other unexpected functions (like social plugin might hook into it to insert social buttons).

$text = rwmb_meta( 'wsmbox_page_two_columns_text' );
echo do_shortcode( wpautop( $text ) );