Using the normally inaccessible debug feature to view blocks' collision bounds, i was messing around with pistons when i noticed that west-facing pistons' heads are split up into several unnecessary pieces. Most pistons' collision has 3 parts: the base, the shaft, and the head, but on wet pistons, the head is sliced up into multiple pieces. This can also be demonstrated by lining the bottom of your feet up with the bottom of the shaft of the piston in spectator mode, then going into survival mode to cancel flight. you will land on one of these pieces at y+0.375, instead of falling through like you would on any other piston.
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@Galaxy_2Alex I am using a mod to make them visible, but you can stand in the specified location in vanilla (only on west-facing pistons)
with a piston placed at ~1 ~ ~ then extended west, teleport yourself to ~-.825 ~.375 ~.325 and face due south. you will be unable to moe forward unless you move sufficiently far east so as to get boosted by the piston's shaft, as shown in the second screenshot
What exactly are you using to make block collision boxes visible? Is it a mod?