Under Settings / Gameplay / at the bottom of the page is a setting called "Auto Switch Next Journey. I checked the box expecting it to choose the next journey for me but it did not. I was not going in order in the journey system so maybe it didn’t know where to go next. I selected it while on the Alchemist journey and completed it, Then I selected PotionMaker and completed it. Both times on completion I was left to make my own choice on what journey to take next.
Thank you for pointing this out.
Passed this over to the rest of the team for further investigation.