Check what the woocommerce actions returns. Nice for checking priorities and custom hooked in code.
Place in functions.php
add_action( 'woocommerce_after_main_content', function(){
// Only for admin user role
if( ! current_user_can('edit_products')) return;
global $wp_filter;
echo '<pre>';
print_r( $wp_filter['woocommerce_after_single_product_summary'] );
echo '</pre>';
}, 50 );