* Deathlike2 shrugs.
Hmmm, apparently the Optimal menu isn't that bright. Apparently when you have already equipped a weapon (and probably armor as well) that has the 2-weapon property, selection the Optimal option may select weapons (and equipment) that don't have said property, and equip two weapons anyways. The subsequent selection of the Optimal option will remove the second weapon because no equipment has the bit set.
It would be a complex fix though.. since you have to check all the selected optimal equipment for the bit in addition to the first optimal weapon being selected...
There are a number of bugs with the check, but probably not worth dealing with because they are supposed to be controlled by the Relics by default.
We have EVEN MORE themes now, but some old ones are gone...