I have a problem with object scoping (at least I think that's the term I'm looking for).
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If you walk on top of multiple blocks to hide them and then keep standing on top of one, they all remain hidden until you move away, even though only the one you're on top of should remain hidden. I'm not a Fusion expert by any means, but as far as I've understood, the first condition ("IncrVal of Block Outline >= 0") should specify which block to keep hidden.