From Bryan Grunow:

"It appears something is broken in CR3 when iterating query results. The count comes back correct but the values returned are all null. It does work by getting the results via the CacheQuery.list() command.

This appears to be because the list() method uses KeyTransformationHandler.stringToKey(key) to get the key whereas neither of the iterators use this so the key that they try to look up results by is prefixed."