Mage Spellslinger: Signature spell and Shifting shards choice node is bugged

[Chronomancer-quelthalas]

That node appears in red, but it still allows to choose the rest to the hero talents.

[Kethrenan-medivh]

I’ve got the same problem with signature spell.

[Solitha-silvermoon (Solitha)]

Yup, same. Made sure I had Magi’s Spark and Touch of the Magi selected. Don’t see any reason for it being red.