“register_rest_route was called incorrectly” in WP 5.5 RC2

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Hey Wordfence. Thanks for a great plugin 🙂

If I enable WP_DEBUG on my WordPress 5.5 RC2 test bench, I get this message when editing posts:

Notice: register_rest_route was called incorrectly. The REST API route definition for wordfence/v1/authenticate is missing the required permission_callback argument. For REST API routes that are intended to be public, use __return_true as the permission callback. Please see Debugging in WordPress for more information. (This message was added in version 5.5.0.) in /home/oldrupdk/oldrup.net/wp-includes/functions.php on line 5225

Please let me know if I can assist in further troubleshooting.
Bjarne Oldrup