Tags pages for different Custom Post Types and WooCommerce Products sharing Post Tags

I found out !
I just had to declare the paged rewrite rule before the non-paged rewrite rule…

add_rewrite_rule( 'activities/([^/]+)/page/([0-9]{1,})/?', 'index.php?tag=$matches[1]&product_cat=activities&pages=$matches[2]', 'top' );
add_rewrite_rule( 'activities/tag/([^/]+)', 'index.php?tag=$matches[1]&product_cat=activities', 'top' );