Hello,
If I enable "reCAPTCHA Version 2" for "Guest" comments, it work on in the "Comment subscriptions section" but not in the "posting of a comment".
Strangely, if reCAPTCHA Version 2 is enabled for "Guest" comments, it is still possible to post a comment while reCAPTCHA Version 2 is not displayed.
On the other hand, if I try to reply to a comment, reCAPTCHA Version 2 is still not displayed and I get an error message.
Sorry for my bad English language, I hope you understand what I write :/