When one goes to high Y values (in excess of 20,000) and it is snowing, snowflakes will take on an unusual appearance- primarily in that:
1- they will fall in a more disjointed, glitch-y manner, although their overall motion is not slowed, increasing in glitchiness with Y value.
2- they will become extended vertically in a seemingly static pattern, increasing in height with Y value.
One can reproduce this effect by traveling to any area where it is snowing, making it snow, and traveling to the same X and Z location, with a Y location of at least 20,000, but most easily noticeable above Y=50,000.
The below images are from 1.9 and 1.9.2, although it has also been tested in 16w14a, 16w15b, and 1.9.3 PR1.
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@unknown, that's only the teleport hight limit, you can still fly up.
However, duplicate of MC-88330.
How did you test it in 1.9.3-pre1, if we are limited to 512 height?