vc_button-fix.php

add_filter( 'shortcode_atts_vc_btn', '__tm_vc_button_macros', 10, 3 );
function __tm_vc_button_macros( $out, $pairs, $atts ) {

	if ( ! isset( $out['link'] ) ) {
		return $out;
	}

	$link = $out['link'];

	if ( false === strpos( $link, '__home_url__' ) ) {
		return $out;
	}

	$home_url    = esc_url( home_url( '/' ) );
	$home_url    = untrailingslashit( $home_url );
	$home_url    = preg_replace( '/http[s]?:\/\//', '', $home_url );
	$out['link'] = str_replace( '__home_url__', $home_url, $link );

	return $out;
}