@HYBRID_BEING
After reading the manga and combing through the author's Twitter, I'm confident that they won't change Chapter 20, at least not drastically. I found some tweets here:
https://twitter.com/asakotofuji/status/1228682503994535936
https://twitter.com/asakotofuji/status/1228681243849449473
If the translations of these tweets are correct, the author's advertising the famous sex chapter as one of the selling points that will be in
the elusive Volume 4 of the manga
which is finally coming out after over a goddamn year. IMO, the worst case scenario is that MangaCross does some censoring and the uncensored version comes out on March 6.