0.4.5

Describe the bug
Using vanilla mechanics to create a very simple piston setup to retract a flush floor results in glitched blocks, right clicking the blocks makes them re-appear.

Screenshots

Relogging does not resolve the issue. They will reappear yes, but after the pistons are reactivated, the blocks disappear again

Desync? Try relogging/relaunching game.

I can't reproduce this issue. Which blocks are you pushing, and how is the redstone going into the pistons?