How is this a problem? Every network interface should be treated as public, meaning you must use encryption and firewall rules.

Hi there HN readers, I checked with some team members. They are aware of this behavior and have told me that it does not cause a security risk. If you have any additional questions or concerns, please write a support request using your account. --Katie, Hetzner

Tje only time i had problems with wrong traffic were when domain owners didn't update their records for decommissioned servers.

We have independently confirmed that we are getting traffic designated for other servers on our serverauction root server at hetzner. Pretty sketchy feeling to have this be the case for a hoster on the scale of hetzner.