I don’t know how normal weapons could work as focuses. Spells are cast and cancelled using the regular attack buttons and can only be used as a weapon with its special attack. How would a regular sword, daggers, or mace be able to cast spells and still be a weapon?
The best you could hope for would be a focus that only looks like a weapon, but is really just a focus.
These weapons are not focuses, and I don’t think they ever could be. I do not think there is any bug here, just misleading descriptions.
They also added a long press function while using the build hammer. They could implement that while maintaining the same button layout for casting and canceling.