Blade Dancer Thundering Blade Training room glitch - Soul Stab skill

[Omicron77]

It seems that for the Blade Dancer Thundering Blade spec there is a glitch in the training room that prevents completing the "Key Skill - Soul Stab" training. During the training you are supposed to use Soul Stab during Phantom Grip but the skill button becomes locked. It actually works on the training dummy, I can use Soul Stab there but not during the actual training.