Given a subtree of entries spread over several servers and linked using referrals. When performing a subtree search, that follows referrals, some
of the continuation references get ignored and the entries that they
reference do not appear in the final search result.

The problem occurs when following continuation references that in turn
generate further continuation references. Currently, the references are
processed depth-first. However, as the more recently received references
are processed some of the less recently received references are lost.

The effect is the no error occurs but the number of entries returned is
less than expected.