I feel like that would be fine for someone who doesn’t know the other grammar point (ならない in this case), but it would frustrate someone who does know it because you can have a few interpretations from this one sentence and either of these answers are potentially correct.
The only way to force it into one or the other is to provide context, which BunPro sometimes does (not in this case, of course).
But that’s the thing, bunpro is not consistent here, because for instance if I go to the ば point and answer using と it rejects the answer, asking me to use a different construction:
And, if I’m not mistaken, without further context this is a perfectly acceptable sentence as well.
And, to be clear, I think this “soft fail” approach is better than just accepting a different grammar point, otherwise I’m not practicing the right construction.
OK, that is a good example. I agree with you that BunPro should be consistent (at least in terms of soft failing an answer when it’s not the desired grammar point).
