Your example of けど is even more jarring, honestly.
I passed N1 way back in 2021, so I’m really not fussed about what is or isn’t what JLPT level anymore. I’m just going back through all of Bunpro (grammar, not vocab) as a review and to make sure I cover any weird gaps I still have in my grammar knowledge/learn new perspectives for grammar I already know.
I was really more intending for this to be a question for the Bunpro team, as to why this kind of thing isn’t more aligned. I assume it’s something as innocent as it’s just not possible to make sure that every grammar/vocab is perfectly aligned from every angle you may compare them.
I imagined if a new learner who I recommended Bunpro to asked me “Hey, I learned this vocab the other day studing for N3, but why is it listed as N1 level for grammar? I’m not studying for N1, which is it?”, I wouldn’t really know the answer. Just something I was curious about, not super worked up or stressed over.