Comment 1 for bug 1808089

I'm pretty sure there is a tempest integration test for the scenario you're describing:

https://github.com/openstack/tempest/blob/ce4b7d246e09b4dfcd7f9ecef3b2318b010396ac/tempest/api/compute/volumes/test_attach_volume.py#L162

Specifically test_detach_volume_shelved_or_offload_server creates a server, shelve offloads it, attaches a volume to the shelved offloaded server, then detaches the volume, and then unshelves the server.

So I'm not sure what you're describing is a break in the existing API?

When you say, "And when I call detach volume on this, I got:" - which API are you specifically referring to? A compute (nova) API or a block-storage (cinder) API?