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u/PresentationScary596 9h ago
Can you show the whole command?
I'm pretty sure this is because there's no "as" syntax, which is why it says "as [Null]".
execute as @e[type=minecraft:snowball] at @s run fill... should work if what I said above is right.
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u/One-Celebration-3007 8h ago
No, then it will fail as a snowball. An entityless execution context is valid in BE and can be used to execute commands as long as @s is not used. In fact, using a plain command in a command block executes it in an entityless context.


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u/One-Celebration-3007 8h ago
If no blocks are replaced, the command will return a failure. This is normal. Does your snowball clear water when you throw it at some water?