Why was this bug created against Nova? AFAICT this behaviour appears correct assuming the two volume types have differing encryption or QoS properties :
https://github.com/openstack/cinder/blob/362062935b87d97a2ce94a648c6dea67f9afe37e/cinder/volume/api.py#L176
https://github.com/openstack/cinder/blob/362062935b87d97a2ce94a648c6dea67f9afe37e/cinder/volume/api.py#L1568
Why was this bug created against Nova? AFAICT this behaviour appears correct assuming the two volume types have differing encryption or QoS properties :
https:/ /github. com/openstack/ cinder/ blob/362062935b 87d97a2ce94a648 c6dea67f9afe37e /cinder/ volume/ api.py# L176
https:/ /github. com/openstack/ cinder/ blob/362062935b 87d97a2ce94a648 c6dea67f9afe37e /cinder/ volume/ api.py# L1568