I believe Kingdom Hearts is textbook definition of this. I think Nomura did have largely pure intentions, but things quickly grew out of his reach and goals when he switched dev teams and just couldn’t really maintain the same work ethic. KH2 and onwards are all practically different games because they quite literally are. It’s thanks to Yuichi Kanemori that kh2 was half as good as it was.
He’s the real heart and soul of the series, but had sadly had diminishing influence as KH shifted dev teams and studios around and was unfortunately still left in the misguided hands of our old buddy Nomura, who still wouldn’t direct game properly even if the project was given to him on a silver platter, which it practically was, given that KH was quite literally an elevator pitch LOL.