Add class to CPT archive link in menus when viewing a post of that type

current-menu-item.php

<?php
// Add current-menu-item to post type archive link for this post's type
function doublee_menu_classes($classes, $item) {
	global $post;
	$id = (isset($post->ID) ? get_the_ID() : NULL);

	if(isset($id) && $item->type == 'post_type_archive') {
		$current_post_type = get_post_type($id);
		$link_post_type = $item->object;
		if($current_post_type == $link_post_type) {
			$classes[] = 'current-menu-item';
		}
	}

	return $classes;
}
add_filter('nav_menu_css_class', 'doublee_menu_classes', 10, 2);