I believe the attached photo shows all that is necessary, however the corner pistons should not be powered at all, I have attached the world for anything else you would like to check.
edit: it is not only pistons
I believe the attached photo shows all that is necessary, however the corner pistons should not be powered at all, I have attached the world for anything else you would like to check.
edit: it is not only pistons
migrated
(Unassigned)
Unconfirmed
moving_piston, piston, piston-extension, redstone, repeater, slab
Minecraft 1.14.3 Pre-Release 2
Retrieved
Duplicate of MC-2255