Couldn't think of a better title, sorry.

Say you have a gearshift attached to a mechanical piston. When the piston extends, the blocks it pushes are turned into a contraption and move along the piston's axis. (Say, down)
Let's assume the contraption is pushed into a fluid, like water or lava.
When the gearshift is then toggled, before the piston fully extends, the piston retracts again.

If the redstone signal controlling the gearshift was triggered by a manual action (for example, a lever), the contraption does not reform into blocks and the fluid remains undisturbed.
If, however, the redstone signal was triggered by a redstone component (like a repeater or comparator), the contraption does briefly reform into blocks and destroy the fluid.

I would expect it to make no difference how a redstone signal is triggered. As far as the player is aware, a redstone signal is a redstone signal - when exactly within the tick it gets handled should not impact gameplay.

This issue has been marked as stale because it has been inactive for 3 weeks. It will be closed if it remains inactive for another 3 weeks.

This issue has been closed since it has been inactive for 3 weeks since it was marked as stale.