title: Sandbox trying to restore consumable IAP
body: <p>I've been trying to test some consumable IAP on iOS, and I'm getting a strange error. An alert pops up with the text: </p>
  
  <blockquote>
    <p>"This In-App Purchase has already been bought. It will be restored for
    free. [Environment: Sandbox]"</p>
  </blockquote>
  
  <p>I have checked, and I'm certain that my IAP is consumable in iTunesConnect. It seems that my validation process is somehow failing, but I wouldn't expect this error message. Does anyone have any experience with this?</p>