Scaffolding vibrates when placed on an extended piston arm

Can Confirm and reproduce, it gets the form of when it is not connected under. Here is a piture so you can get a better understand.

It does not seem to be an issue with other falling blocks (block that have the proberty to fall when not hold by a block underneath)

on the picture, you can't see it bobbing up and down, but you can see the reuslt of so by watching the ege of the piston being not in sync with the scaffolding block