Comment by JdeBP

For the people asking what kind of DNS service this is, content or proxy: You have to look 'Bunny DNS' up in the products menu and from there follow the hyperlink to the doco.

* https://docs.bunny.net/dns

So it's content DNS service; with server-side resource record shuffling; and with JavaScript, and badly written examples that don't check the question type, just to make it weird.