Script output for preview is not being marked as dev mode creating validation error about amp-wp HOT 2 CLOSED

function wp_post_preview_js() {
	global $post;

	if ( ! is_preview() || empty( $post ) ) {
		return;
	}

	// Has to match the window name used in post_submit_meta_box().
	$name = 'wp-preview-' . (int) $post->ID;

	ob_start();
	?>
	<script>
	( function() {
		var query = document.location.search;

		if ( query && query.indexOf( 'preview=true' ) !== -1 ) {
			window.name = '<?php echo $name; ?>';
		}

		if ( window.addEventListener ) {
			window.addEventListener( 'pagehide', function() { window.name = ''; } );
		}
	}());
	</script>
	<?php
	wp_print_inline_script_tag( wp_remove_surrounding_empty_script_tags( ob_get_clean() ) );
}