Expanding and porting to Java Minecraft Bedrock snowlogging

Minecraft Bedrock has the ability to allow multiple blocks to occupy the same block space, and this is currently very limited, with the only cases being snowlogging, which I mentioned in the title and is where snow can occupy the same space as small flowers, and the ability for water to flow through some non-full blocks without destroying them, such as repeaters, end rods, and dripleafs. I am suggesting to expand the mechanic to allow for much more possible block combinations, as this would be very useful both in building and redstone. My idea as to how this would work is that all non-full blocks would have two "hitboxes". The first fully encompasses the block, and would likely be the same as the block's actual hitbox. The other one could be smaller or not there at all (in the case of things like water, lava, snow layers, etcetera) and only encompass's parts it doesn't make sense for other blocks to occupy. A block can be placed in the same space as other block(s) if its smaller box doesn't intersect with any of the other block's smaller boxes, and if it's larger box isn't completely occupied by the other large boxes. As for pushing blocks, I am not sure whether multiple pushable blocks in the same block space would count as one block or many, that is something that would need to be decided. I also assume that if a non-full block is moved into a block space, any blocks there will only be attempted to be pushed if there smaller box is in the movement path of the larger box.