I'm migrating from 1.9 to 3.1 and I noticed that the list_instances() method used to return type Instance<google.cloud.spanner_v1.instance.Instance> but with the latest it actually returns the spanner admin instance<google.cloud.spanner_admin_instance_v1.types.spanner_instance_admin.Instance> which does not have the instance_id. Thus I now get an AttributeError.

I'm unsure if this is a bug or if the documentation just hasn't been updated.