Thanks so much for reporting this bigblue, I'm already working on a fix.
There is a workaround for now, as the intended instance of Jonson exists past the north gate with dialogue that will allow you to continue the story.
The instance of Jonson you encountered was supposed to be cut from the game, but I overlooked that in testing.
I see that the dialogue leading up to that part of the game still indicated that he'd meet you in the guildhall, which lead you to the old wrong Jonson. That will be removed and the dialogue corrected in the upcoming update so there should be no more confusion, and only the one true version of that character.
I'm so glad you enjoyed the game, and thank you once again for reporting this!