To reproduce in singleplayer:
Build the attached design (first screenshot, or third screenshot for a design that doesn't depend on BUDs), flip the lever on. Note: The piston is a sticky one. The piston should extend and retract quickly.
To cause the bug, either
die
alt-tab out of minecraft for some time
save, exit to menu and reload the save
just wait, walk/or look around as it seems to happen randomly, too
Actual outcome:
The piston is still pulsing, but the piston arm and the pushed block is invisible (picture 2)
Expected outcome:
Piston arm still visible
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kumasasa
I'm getting the issue just by looking around. No need to die, save or ALT-Tab to reproduce.
I can confirm that it also seems to happen randomly when doing other stuff, but it may be somewhat awkward to reproduce this way. Dying or reloading the game seems to reproduce the issue in a reliable way.
This is sort of fixed in 13w01a as this type of 1.5 redstone tick clock stopped working.
Resolving as fixed then.