I came across this sentence but it shows 行く as "potential stem". I can't find anywhere else where the term potential stem is used. It is not listed in the confugation table. And the lesson on potential form does not mention it either. Should this have been imperative form or is potential stem missing from the conjugation table?
Definitely a parsing mistake - in cases like that (I'll fix this one since you reported it here), just tap the eye below the sentence and jot that down in the box that appears. In this case, it should be the command form.
That being said, though, the stem itself is something that can be applied to any other conjugation "base" form (passive, potential, causative) - it's more of a chaining of rules, and not a uniquely different thing.
