Using structure_block under Y=0 (so Y-1 through Y-64) the structure_block would not accept a Y value less than the Y =coordinate it was placed on + the required amount to equal Zero (so if working on Y= - 63 the structure_block would change the user(my) input value from 0 to 63
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We're tracking this issue in MCPE-122643, so this ticket is being resolved and linked as a duplicate.
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