It's not a bug. This is actually because of a very simple reason: we prioritized the romantic and ruthless routes, which was necessary given how much content we were trying to pack in.
This left us in a dilemma. We could either make it so the "neutral" route ended prematurely or we could make it branch back into the romantic route. None of those is ideal but, for now, we made it branch back into the romance because we thought less people would be confused with that option.
Someday we'll get back to the neutral route and give it a proper treatment.