ThighHighGames
On a new game+, choosing extra Love Stones, I couldn't add Cami to my squad as soon as I found her. Once I found Zaria, I could only have either one of the girls in my squad, but not both. With a 3rd girl in the car, I could finally pick 2 in the squad.
Starting a new game (holding backspace to delete reset) didn't have this problem. Currently grinding thru this new game to see if this'll happen again, as the previous save was from r18
For some reason, during this new game, some anal sex scenes with Oriana ended as soon as they began. I'm not entirely sure what could be the cause, as even turning off the turbo had a single "miss", which was the very first movement, be enough to finish it.
EDIT2: Starting this newgame+ is somehow messing up squad selection until you unlock several girls. Video proof -
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A similar problem once happened with Talia, as she assaulted me for sex (due to heat) but, before I had time to react, it was over. A 1 second lead to align the hitbox before the sex starts proper would possibly fix these problems.
The problem with using items when they make no effect continues, IE: using Star Crystals on a girl that's already maxed at everything will consume the item but have no effect. Same with Heart Peppers, you can use it when a girl is at 100 heat, but there's no effect. (no idea if you fixed these things for r20)
EDIT: Another problem I've found is that if you use the Copy X and use the girl you copied in your squad, she won't give her full bonus. For instance, bringing Talia while also being a shark will override her actual damage bonus.
The problem with things not unlocking if the girl's using a different palette are present here. Unlocking UI colors and rooms doesn't happen if they've been modified by the Prismatic Apple or Animal Mirror. I've also noticed that, if you get a girl to 300 love while being on the receiving end of her futa cock, their respective room won't unlock, but if you sex normally as the giver, it'll unlock afterwards.