When i put Blocks on sticy pistons and make them go fast i get pushed of the Bloch and the piston.
When i put a honey Block on sticky piston and make them go fasts i fall into the piston.
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Can confirm that this is still an issue in 20w51a.

Can confirm this behaviour in 1.16.2 pre-release 2. Accidentally discovered a way to reproduce this much better: by adding an extra slime block to the setup shown in the video, adding a redstone block to it and using the signal from that redstone to power another sticky piston with a slime block, we obtain a piston/slime block "launcher" with a far higher chance of clipping through:
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Based off of the videos attached, this duplicates MC-159503. The pistons are being 1-tick pulsed, spitting out their blocks.