If you use a Wrapper to make Place Block Sequence place a variable number of blocks, it'll work as you expect... until you give it "0", at which point it'll still place 1 block. (Once upon a time, "0" was a functional value for Place Block Sequence - while you couldn't connect a 0 directly to the Max parameter, it'd still accept it through a Wrapper and then place 0 blocks.)

Can you make it so Sequence Tricks once again function correctly when given a Max of 0?