I agree with Alexander :

Prior to HHH-9195 condition if (!OperationQueueEnabled()) translated to if ( !(!isInitialized() && isConnectedToSession() && isInverseCollection())) or in shorter terms if (isInitialized() || !isConnectedToSession() || !isInverseCollection())
dropping test on inverseCollection it should become :
if (isInitialized() || !isConnectedToSession())
and not
if (!isInitialized() || isConnectedToSession())
as in commits for HHH-9195