I was using Chrome 110.0.5481.104 today as I know Firefox is still not working properly, and while building up a goblin alchemist, I was given the option to unlearn crafting (clickable - button), and now cannot re-learn it.
Thanks for reporting! This is a known bug, as you shouldn’t be able to deselect that ability. We’re working on a fix for it.
In the meantime, the only fix is to re-create the character from scratch.