When you look at it as a particle, it has no motion, t=0 and thus is has no wave function. It only has a wave function when it is moving. There is no change in velocity of photon velocity... it's constant all the way down and all the way up. It doesn't change speed in the quantum world. In the real world, the change of speed is a change of vector or a change in direction.
So while it appears to slow down in one dimension, it gains speed in another dimension. Looking at this in a classical 3 dimensional sense.
Feel free to play with extra dimensions if you wish.
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