When using ice roads it is common to use a button to mob proof the ice road.
Since 1.19.10 came out, it is no longer possible to place the boat down on an ice block that has a button on top. It doesn't matter if your cursor is on the button or the block itself, the boat cannot be placed.
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We're tracking this issue in MCPE-159084, so this ticket is being resolved and linked as a duplicate.
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