register_rest_route was called incorrectly

Hello,

When Zapier plugin is active, it appears this message every time a post, page or custom post type is edited:

<b>Notice</b>: register_rest_route was called <strong>incorrectly</strong>. The REST API route definition for <code>zapier/v1/token</code> is missing the required <code>permission_callback</code> argument. For REST API routes that are intended to be public, use <code>__return_true</code> as the permission callback. Please see <a href="https://wordpress.org/support/article/debugging-in-wordpress/">Debugging in WordPress</a> for more information. (This message was added in version 5.5.0.) in <b>/home/server/domain/wp/wp-includes/functions.php</b> on line <b>5225</b><br />

Zapier for WordPress 1.0.1
WordPress 5.5.1
PHP 7.4

Feel free to report if this also happens to you or it is only me. Many thanks!