#solid block? invalid move
execute unless block ~ ~ ~ #bd:passable run scoreboard players set global validMove 0
execute unless block ~ ~ ~ #bd:passable run scoreboard players set global validMoveXNEG 0

#z-axis linked blocks must travel together
execute if block ~ ~ ~ #bd:z_axis_linked if block ~ ~ ~-1 #bd:z_axis_linked positioned ~-1 ~ ~-1 run function bd:movement/check_move/x_negative
execute if block ~ ~ ~ #bd:z_axis_linked if block ~ ~ ~1 #bd:z_axis_linked positioned ~-1 ~ ~1 run function bd:movement/check_move/x_negative