"Limited to 1" Runes not working correctly with Weapon Swap

If you have the same rune in 2 different weapons, and that rune is one of the "Limited to 1" runes, it will completely disable your weapon in Weapon Slot 2 even though they are never active at the same time. This can't be intentional, right? It's really restrictive for no reason.

"Limited to 1" should only apply to active weapon sets.