The public ItemFits(item, coord) the inventory drag asks counted the dragged equipped
item's own cells as occupied, so a nudge overlapping its current cells was refused.
The private rule now takes the item being moved as an excluded occupant. TryEquip
and TryFindSpace pass none and stay strict, so equipping an equipped item twice is
still refused; the UI keeps TryUnequip then TryEquip (cargo bay emptiness rule).
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>