[Nova][queens] disk.config not found issue

Hello All, after a compute node failure if I try to reset state and hard reboot an instance it fails because disk.config file does not exist. I am using cinder with netapp nfs driver and I am using disk config drive. It happens also on stein. Any help, please ? It can be' solved creating the disk.config with touch command but it does not seem a good solution . Ignazio