Everytime i break a block too quick with my efficiency 4 netherite pickaxe,the block dissapears but apprently the game thinks it still there and acts like its a thing you can drown/suffocate on?
Plus you can walk through it like theres nothing there,and the only way to fix it is if you place a block on the air that you suffocate(Even though theres nothing there) what it does is everytime you place a random block there your thats in your inventory will dissapear but will be replaced in the spot you put it on by the block you broke that you also suffocate on with bubble bars.