ToME: the Tales of Maj'Eyal

I was playing with an level 12 Cornac Alchemist when I realised my talent for creating new alchemist gems had disappeared from my hotbar. I went into the talent menu to put it back on and discovered I had lost it entirely! This kind of screws me over because I can't revive my golem and can't get new gems for bombs. I don't know exactly when it happened, I was just playing through the Old Forest when it happened. According to chat this happened to somebody else earlier too so it looks like a new bug.

Did you unlearn extract gem talent ? I dont see it either

Off the top of my head, I'm pretty sure it's not unlearnable.

You don't get extract gems by default, so it's possible (although unlikely) that he never learned it.