Just copying what I wrote in reply on Discord...
The only way you could get the MFF scene with Maddie is if you had sex with April on the first date night (Day 20 - Saturday) and you were on both Maddie and April's LOVE paths. So if you got that scene, then you probably changed a flag that was not supposed to be set. I can't design a VN that works when people go into the code and fuck with the variables... so... dunno what you are expecting.
As for the paths in general, I already said on multiple occasions that I wished I had done some things different for the first Act of the reboot. When I started this thing, I knew very little about Ren'py coding. I know a lot more now but I can't change the old content without a shit load of work. In any case, this VN was planned around April and Maddie being core to it. I honestly didn't think someone would play only one LI through the whole thing, so that path will be "weak" - I'm not about to go back and change anything now though. Heck, just that date night scene has 7 possible variations alone. Eventually, after this VN is finished, I'll do a rework/director's cut or something, and streamline a lot of the old path choices and upgrade scene renders and animations.
As for the crossover scene with the motorcycle delivery, it was a new bug in the mutli-persistent code that I had added. I posted a hotfix on the previous page for it. With the hotfix, those characters will show default names if you haven't played A Dark Horse Riding yet.