when you plot reset you have to save with the new save file ...if you accept what you see.
ie - you might plot reset and have no new villager - if you are happy with no villager, then save with the new save file and then reload with the mayor.
If you don't save with the NSF, then when you load with the Mayor things can change - so instead of no new villager plotting, a villager may have appeared.
You always have to save with the NSF - its easy to forget, not sure from your opening post whether you did or not.
If you did, then you must have missed the new villager plot - that's easy to do as well.
I never TT around a plot reset - I like to keep things simple. Although the TT in itself would not cause what has happened, its either not saving with the NSF or not finding the plot.