GTS unlocks for non-hero classes generally won't work due to the way the Amalgamation specializations are set up. Specs are expected to hide any that they can't use, but this tends to be a bit fiddly and stuff does tend to slip through.

(may see a mod that cleans this up a bit one day, I was poking around a bit earlier and it should be doable if someone can think up a good set of rules)