Image undelete appears not to be confirming that the file was properly re-written to the filesystem before removing the archive info from the undeletion tables. (filearchive)
This can result in for instance a useless 0-byte file sitting there:
http://upload.wikimedia.org/wikipedia/de/7/70/KKH-Allianz_Hauptverwaltung.png
http://de.wikipedia.org/wiki/KKH-Allianz_Hauptverwaltung.png
Version: unspecified
Severity: major