volume/coordinate selector help

I've been finding volume selectors and the coordinate selectors to not be doing what I think/have learned they should be doing. Here's one of my commands, I'm trying to prevent the cloning from occurring if the entity goes below y 60. execute as @e[name=BuildingMarker,scores={BreakTimer=60..}] at @s unless block ~ ~63 ~ #dirt positioned ~ -64 ~ unless entity @s[dy=124] run clone ~ ~18 ~ ~ ~18 ~ ~ ~63 ~ replace force I also have another command with a unless entity @s[y=42] trying to prevent an action when the entity was at y 42, but it wasn't working either Could someone help me understand volume and coordinate selectors?