This paper reviews experimental setups in which it was possible to prove, based on measured photon crosscorrelation suppression effects at the beam splitter and using prepared squeezed states, the nonexistence of a definite value of the photon phase difference in Fock states (otherwise these two effects cannot exist simultaneously). It is shown that this conclusion emphasizes the internal inconsistency of the quantum mechanics interpretation in the spirit of classical nonlocal "realism" — in the sense that measured physical quantities have no definite values a priori, i.e. before the moment of measurement.