Certain posts are sent to Anti-Spam service with empty body

Could it be because we use Redis?

It also seem that when editing a certain node, empty message is sent in all cases - 100% reproducible

Hello,

Could you please provide us with the following information?
1) What version of Drupal and PHP are you using?
2) Are you using the default form or some custom one? If custom, how did you make it?

This information will help us better diagnose the issue.

Looking forward to your reply.

1)

PHP: 8.3.11
Drupal: 10.5.1
Server: nginx/1.24.0 with MySQL DB

2) We have observed this on forum topics by forum module, as well as when users post custom content types, but with built-in node forms. When editing nodes, the message body seems to be empty in every case.

We also have custom validators applied to those node forms using a custom module, but those validators only check for certain patterns in e.g., topic body and fail server-side form validation by using "setErrorByName".

Here you can see some examples with an empty message in logs:

Hello,

The reason the message body and sender's information are empty in the allowed requests on your site is that you've deactivated the storage of allowed requests. This means no data, except IP from allowed requests, is being stored on our servers. Please take a look at this article to learn more about this option: https://cleantalk.org/help/store-the-content-of-messages

Thank you.

I figured that out as well :) Sorry for the inconvenience.