I never cheated in the game, never instaled a mod, and the scene with that decision was COULD affect relation with the other, as far as I know I'm in good terms with them both, I chose Georgina but had a scene where Jennifer ask if MC would let her help D accept her or something along those lines
I played just now pressing ctrl to skip that part and I got a new scene, where MC rejects Jennifer and they break up, so what I think happened is that I played 0.21 and Mr Dots fucked up leaving the possibility of dating them both opened, that's why he released later 0.21.5, blocking it, I didn't replay the chapter, I just downloaded it