I have a wave device showing up in X-Ray, that I believe was a failed add of my Schlage lock. My Schlage lock eventually added, but in a different zwave slot, so now I have a ghost device that is not listed in the Main tab, so I can't remove it as a failed device.

Also, it wants to update the neighbors when healing the network, and it fails every time, causing the all devices after it to also fail.

Is there are way to unhide (of just remove) devices that failed their initial interview?

Me too. One ghost device with Interview not done. 

Follow up on this issue, in case anyone else find it by searching.

After updating to 5.5.9, I was able to get the device to show up by running Synchronize/New &Deleted with interview.
Once it was listed, I could delete it with a simple right click delete 

Also, with 5.5.9, the network healing process did not fail when it hit the phantom copy of my Schlage lock.

Still nice to have it gone.