I hate "nothing can prevent it" because the concept of the game is informed minorty vs uninformed majority and it kind of goes against that to fuck over your mafia team's gambit attempt to reveal there's some town vote role in the shuffle and they didn't actually win. Mafia should definitely have a solid and reliable win con they are able to gambit for

I think the 50% hosts have day in mind and the over 50% hosts have night in mind. There's a good argument for either. Definitely a stupid to run a day where mafia can just tie it, but also feels improper to go into a 50/50 night where town still has a shot. Basically I think you can argue just fine for either but the win con should be public knowledge and you just let your players play to whichever you feel is best for your setup

But this is why I generally don't like vote related roles, especially townsided ones