Error subscribing user with Gravity Forms feed

We are getting a strange error on some of our Gravity Forms submissions. This is only happening with about 1 in 10 submissions, so I’m not sure I can specifically highlight one cause. Other feeds are working correctly so this seems to be a CK plugin issue.

Note we’re using PHP 8.2, WP 6.4.1, GF 2.7.17, and the CK for Gravity Forms v1.4.0. At the time of this writing, everything is at the latest version.

Here is a screenshot of our CK feed. There is nothing abnormal.

Please advise on next steps as the unreliability with the plugin represents a critical issue for us.