I’m running into the same issue but I’m not getting any PHP errors in the log. I’m using the ACF form on a plugin settings page. When the form is submitted before the eventual page refresh it tries to call the same admin URL that it was on but this time with the form POST data. I’m getting a 500 on that call yet no errors go into the server PHP log.
Is there something unique to this case where I’m using it for an settings page in a custom plugin?
