Attempting to place a door or 2-block plant one block below the height limit will not give an error message, despite still failing
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The bug
When a door (or 2-block plant) is placed so that the top half of it would be above the world build height, it refuses to be placed, but the usual message about the world build height being there is not shown. Placing one so that both halves would be above the limit shows the error as usual.
In 1.16, 1.16.1 and 20w27a