Well, selecting only the middle keyframes not also selecting the handles was NOT a bug apparently, or I misunderstood what you are saying?
Did you change so that If I box-select the keyframe will automatically select the handles? This is changing decade old expected and loved behavior for animators.
But I agree that not being able to box-select the handles only was always a issue that I had. (Which is different from auto-selecting handles when I don’t want to)
Anyway, if you check Orkar’s original complaint, he is clearly selecting only the middle, not the handles. And like I’ve proven with the above gifs, this is working as intended.
But, I once complained about not being able to work with multiple handles of different curvers on the Animation Improvement topic, and someone answered that there’s an option that helps, does this makes it so that you can box select them as well?