Deletions identified by knownObjects on the initial sync replace
(immediately after the List from a reflector) should be considered part
of the initial sync since we have the information available at the time
we do the deletion.

An error during Replace() can result in Populated not being set, but it
was incorrect before (population would be wrong) and queueActionLocked
does not error except on "my cache is broken because I gave an incorrect
keyFunc".