Seems that admin_post_{action} does not executing
It’s simply the wrong endpoint. The admin_post_* hook and its admin_post_nopriv_* counterpart is not fired for any admin page with the appropriate action request variable set, it only triggers for requests hitting wp-admin/admin-post.php. Try https://test.local/wp-admin/admin-post.php?action=test instead. I should add that using admin-post.php for handling plugin actions might not be appropriate. If you wanted to return … Read more