protected function _add_data_srcset_to_content_image( $image, $image_id ) {
		return preg_replace_callback(
			'@(<img decoding="async"[^>]*?)srcset="([^"]+?)"([^>]*?>)@m',
			function( $matches ) use ( $image_id ) {
				return sprintf(
					'%s srcset="" data-srcset="%s" %s',
					$matches[1],
					$matches[2],
					$matches[3]
				);
			},
			$image
		);
	}