@humptydumpty thanks for the info! Cloudron should not be affected, no. We don't rely on name servers IPs. Also, I think this is for people having vanity nameservers, which Cloudron does not support.
@matix131997 This was a bug in the UI code (setupdns view code). Fixed in https://git.cloudron.io/cloudron/box/-/commit/003bc457bf95a5b555a83d76b36199f3acec8ece
As a workaround:
Setup the DNS as manual or wildcard for a start
Then, after you setup admin etc, go to Domains View and change it to Bunny. This view does not have this bug.