When using an A+B subscreen, setting only one item to Link->Item[] as being true via Init Data causes that item to appear in both the A slot, and the B slot.
Reported by cukeman on PureZC: http://www.purezc.net/forums/index.php?showtopic=70466
[2.50.2: Passive Subscereen A+B] Single item set by init data is in both slots.
Confirmed, I know this from experiencing it while testing.
Should be fixed now.