Payback Gorilla bug

When selecting the “Insidious Retribution” upgrade for Payback it changes to a centipede skill as it should but if I then choose the Gorilla in the Spirit Hall it should be Centipede AND Gorilla but it is not.
I have tested and its not a HUD-bug.
Please fix this!

Seems to be an issue on all skills and spirit halls. If you have a spirit selected and then pick and augment in the tree to convert a skill of that same type to another, it will not get the type from the spirit hall.