Can confirm in 26.2.
To fix this, ItemCombinerMenu#quickMoveStack should call slot.onTake(player, clicked) instead of slot.onTake(player, slot).
ItemCombinerMenu#quickMoveStack
slot.onTake(player, clicked)
slot.onTake(player, slot).
Macol
Macol
Can confirm in 26.2.
To fix this,
ItemCombinerMenu#quickMoveStackshould callslot.onTake(player, clicked)instead ofslot.onTake(player, slot).