Currently unable to reproduce this issue. I have sought additional feedback from the reporter to check some details.
If anyone would like to help reproduce the issue, if you enable the NoCaptcha ReCAPTCHA system, do you get a server error when attempting to take an action that requires completing a CAPTCHA? This may require using Tor, and may be specific to certain exit nodes. My theory involves the IP as seen by the server, but I'm awaiting confirmation of that.