When I use slime blocks to attach a water or lava vessel (a liquid source block surrounded on all four sides and below by solid blocks) to a piston and then move it, the liquid disappears or moves relative to the vessel. (If the piston is horizontal, the fluid is water and the block under it is not slime, it jumps to the block behind the piston. If the piston is pushing downward, the fluid does not move and begins spilling over the lowered sides. In all other cases, the fluid disappears.)
Comments 4
To Mustek: I'm pretty sure that even if having fluids disappear is "working as intended", having them teleport across the piston's head and body isn't.
Could you maybe add a screenshot of how to build it, because I don't really understand your description (I am sorry)
I believe the bug being referenced here is that water cannot be pushed or pulled by pistons, but it can be replaced by blocks pushed into it, and @Chris made a "bucket" of water made of slime blocks, so when the "bucket" is moved down from the water, the water does not move and thus pours out over the sides or when the "bucket" is moved up, the water is simply deleted by the block below it moving into its place. This is definitely WAI.
I have reproduced the bug