Copper Gates

A copper grate would be a new semi-solid, full block with an appearance similar to a mob spawner or the top of a scaffolding block (a mesh) made of copper, with one special property: water (and potentially lava) passes through it completely. It would do so much like how water was originally going to be reworked to go through non-solid blocks. Entities like mobs, players, and dropped items would still collide with the block, but liquids can pass through as if it was just air. If this is not technically feasible, then having it be able to be waterlogged would suffice. It should also emit a signal for a comparator depending on if liquid is flowing in the block or not, giving it some more use (like water overflow detection).

If water is flowing over the Copper Gate, then the water would act like the Copper Gate is an air block or if that isn’t possible then it could act like the Copper Gate is a solid block.