I might have an interesting example for you. The 2001 J-drama Antique, based on a manga by Fumi Yoshinaga, plays super-ambigous about pastry chef Ono's sexuality, strongly hinting that he's gay, only to explain away in the end that he's just nervous around women (b/c gay men are nervous around women, right? *facepalm*) for some BS reason having to do with his sister (I think? I honestly can't remember the reason as it's been at least 12 years since I watched it-- my first Asian drama, btw). When I first watched it I just thought, "Wow, that was a real cop-out, weird." Then like a year later, the Antique Bakery manga was released in English and I read it and realized just what a cop-out it really was-- ***SPOILERS**** in the original manga, not only is Ono gay, he's pretty open about it and a lot of that story touches on his & Tachibana's past relationship in HS (not romantic, more one-sided), how Tachibana's behavior at the time relates to an event in his childhood, and how as an adult he regrets rejecting Ono so cruelly... So basically they wanted to adapt an award-winning manga with a gay man as one of its main characters, but changed him to be... not gay after all (don't get me wrong, they didn't suddenly make him *aggressively hetero* or something at the end, but the past relationship b/t the 2 leads is a HUGE point in the source material and they just brushed it aside for the drama-- like why did you want to adapt this story in the first place?!).