IIRC something similar happens with Culinarians. I remember it being stated as to why that's not a problem / doesn't need working around though. IIRC it went like:

While officially time is 'frozen' in the year 7UE:5 / 7AE:1, time still flows on a patch-by-patch basis: 2.0 happened before 2.5 before 3.0 etc. Hence, the job quests are earlier in the timeline than post-expansion patch MSQ.