I don't see any specification of maxPromote in the Diagram definition. Which means it has the default value 1, and only the first piece promoted when it reaches the zone. But the first piece in your table is a King...
I can confirm that the King indeed promotes. But it promotes already on the Pawn rank. I suppose that the autoGate option automatically increases the depth of the zone by 1.
I don't see any specification of maxPromote in the Diagram definition. Which means it has the default value 1, and only the first piece promoted when it reaches the zone. But the first piece in your table is a King...
I can confirm that the King indeed promotes. But it promotes already on the Pawn rank. I suppose that the autoGate option automatically increases the depth of the zone by 1.