I don't speak English and used Google Translate.
1. If you only follow Lilly and Celine's route, Lilly abandons you because the ep013lilly_polyamory variable is false. It's strange that she agrees to share you with so many people, but not with Celine alone. Although after that, I saw the BFF scene in episode 18 and Celine's dialogue about abandoning the pregnancy with Lilly (I didn't see the dialogue with Lilly).
2. In Celine and Vess's Servant route, the Bridge Bithes scene is unavailable due to the celine_harem variable, although the dialogue in episode 20 and her consent in the Over By The Window scene were present.
Is this a bug in the code?
I'm playing with 0x52_URM.