Does not work when creating a new post

If you edit a post or create/edit a page, the plugin works perfectly. However, when creating a new post, the deactivated elements are still displayed. In the plugin there is the function elements_can_be_removed(). This checks whether $_GET[‘post’] and _GET[‘post_type’] are set. In the case of a new post, both values are not set here, which is why the plugin does not work in this case.