Spellslinger activation doesn't automatically swap back to Wand weapon set.

I have a Dueling Wand providing Level 14 Spellslinger, and a Crossbow.



In Spellslinger, I have Ember Fusillade, Rising Tempest, and Ricochet III.



Spellslinger gains Energy as normal. If I manually swap to my Wand and then press Spellslinger, it correctly slings my spells.



However, if I have my crossbow out and press Spellslinger, nothing happens. No spells are slung and no weapons are swapped.

Furthermore, when I try to set Spellslinger's Skill Options...



...There's no option to bind Spellslinger to a weapon set; and indeed, the Spellslinger "gem" isn't present in the skill options at all.

I can sling my spells by first manually swapping or by casting another spell like Orb of Storms, but it would still be nice if Spellslinger was more tightly bound to the Wand that provides it.