no Redstone/piston update except only one way.

That looks to be working as intended. Could you elaborate on what's wrong?

Looks like MC-108, is the bottom piston powered when you update it?

@unknown Testing this contraption myself - the first example that was given in the video was most likely due to QC, but the other two probably weren't, as updating the pistons did not extend them. But it does seem to be WAI.