There are recent experiments that seem to uphold the quantum mechanical interpretation of particles guided by a probability wave. We need to examine them in detail to be sure there is no artifact in those experiments, the same way you might ask if there is an artifact in the Unquantum experiments.
A recent experiment was published in Nature Nanotechnology: Real-time single-molecule imaging of quantum interference.” The fringes are not parallel, and the authors explain this is due to gravity displacing the slower molecules downward. The slower ones would shift the wavelength longer to spread apart the diffraction fringes.
However, the resolution distance at the detection screen is much smaller than the height of the diffraction slits, so there is no velocity resolution to separate these different particle velocities. There is some mysterious problem with this experiment that the authors have not explained. I await their explanation.