template info is empty if load_template()

hi

thanks for this awesome tool, helps a lot, while developing. i have a very small issue, no big deal, but i thought i’d report it.
if i switch the template via functions.php, the “template name” field is empty. i tried to change the add_action prority, but that did not help. absolutly no big deal, the list works just fine.
thank you for this tool

here is the code, i use in functions.php to change the template, based on the parent page ID:

function is_child( $pid ) {
	global $post;
	$ancestors = get_post_ancestors( $post->$pid );
	$root = count( $ancestors ) - 1;
	$parent = $ancestors[$root];
	if( is_page() && ( is_page( $pid ) || $post->post_parent === $pid || in_array( $pid, $ancestors ) ) ) {
		return true;
	} else {
		return false;
	}
};

function switch_template( $tpl ) {
	$template = get_stylesheet_directory() . "/" . $tpl;
	if ( file_exists( $template ) ) {
		load_template( $template );
		exit;
	}
};

function wpse140605_template_redirect() {
	if ( is_child( 20 ) || is_child( 22 ) ) { // lookbook
		switch_template( 'single-lookbook.php' );
	}
};
add_action( 'template_redirect', 'wpse140605_template_redirect', 10, 0 );

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