Based on Sylvain's comment there my understanding is that there is no bug here. As hostname of VM wasn't changed so Neutron didn't allow to attach to the VM port with mismatched dns name. But I'm not dns intergation expert so I will ask someone who knows this part of code more to take a look too.
Based on Sylvain's comment there my understanding is that there is no bug here. As hostname of VM wasn't changed so Neutron didn't allow to attach to the VM port with mismatched dns name. But I'm not dns intergation expert so I will ask someone who knows this part of code more to take a look too.