If there are circulation rules in place preventing holds via the "Default holds policy by item type," intranet users with hold override permissions may still place holds outside these rules by ignoring the warning message. However, the hold itself is never captured. It will not appear on any library hold queues, and does not appear to exist until the item in question is checked in. At that point, the hold reappears and tries to fulfill itself. Because the hold never appeared before this, there was no way to know that the item should be checked in. Holds violating the Default holds policy by item type should be either fully forbidden or they should function like normal holds when an override is given.
*** This bug has been marked as a duplicate of bug 20955 ***