I see! The reason for that is, the villagers can't possibly be brought back after the end of day 8. This is due to spoilery reasons that I assume you already know about, but if not, there is a time limit. Completing the villager quest, while definitely a significant quest, is not a "Main" quest that you must complete to advance the game^^
In other words, your experience was one of the intended experiences. Sometimes you won't manage to accomplish everything, and that's okay.
What I will do is, add a clear warning that time may be of the essence in some situations.