Why can't I delete the expanded volume when its associated virtual server instance is deleted?

When you attempt to delete a virtual server instance with an attached volume that is being resized, the volume remains in an updating state and can't be deleted.

When initiated the deletion of your virtual server instance either manually or by auto-delete, the volume was being resized. The running operation can't complete, so the status of the volume is shown as updating and the volume isn't deleted with the instance.

A volume must be in an available state for operations such as attach, detach, delete. When you are expanding a volume, wait for the volume resize to complete before you initiate any other operations. If you try to delete a volume that's resizing, the volume remains in an updating state and is not deleted with the instance. To delete the volume, reattach the volume to a different instance, and make sure that the resizing is complete (volume status becomes available), and then delete the volume.