when i use sticky pistons with a stone ontop, a sand ontop of that and another sand, the blocks get out of order

I was trying to create a 1 block wide monostable circuit and came up with this (attachment when using it, the blocks got out of order (attachment) the stone should always be on the bottom. this is 1 wide so what you see is the entire thing, I think that this is a bug with pushing a solid block into a falling sand entity but I am not sure, please fix

I also attached some video without the crazy contraption for you to see what really is happening.