/execute @e [type=snowball] ~ ~ ~ fill ~-3 ~-3 ~-3 ~3 ~3 ~3  used to be the command for making snowballs an item that can /fill blocks when they hit the surface they were thrown at. However, in a recent update, this have been command has changed. It is now /execute as @e[type=snowball] run fill ~-9 ~-9 ~-9 ~9 ~9 ~9 . These commands are intended to be used the same way, as well as do the same action. the old command could be placed in a command block and set to execute repeatedly. The new command does not work in the command block, regardless of whether set to act repeatedly or not. If I try to execute the command through a command block it says, "Failed to execute fill a snowball".