This is going to sound biased due to winning because of the changes, but from a hosting perspective I can see why Feliciano made the changes halfway through the game. As a host you have one goal, host a game as well as possible. This can be either be as neutral as possible, or try to make the game as balanced as possible. Of course balancing the game can be done beforehand, but you never really know how some things work out, which might mean three of the mafia are gone by night 4, or that the mafia wins with having no one lynched throughout the game. This might mean the game you worked so hard on for the past months is going to be cut short, which is kinda sad. With this game having 15 innocents, 6 mafia, and 3 masons who have no incentive not to team up with the mafia (unless the mafia proves themselves anti-mason by threatening to kill them), I'd say the balancing was off from the start in this game. Making the masons part of the town as the mafia's win condition is a good way to balance it out (though informing them about it might've been nice). Reviving someone as another serial killer is a more drastic measure, and a way more controversial one, though I also find it understandable to do something like this to make the game go on longer if there are really no better alternatives (like I did in bmgf mafia II when three mafia decided to just straight up reveal themselves at start). Pichuboy even said the mafia was planning on roleblock killing me soon. Knowing this Feli could've thought it wouldn't matter much reviving me like that since I would die pretty soon anyway. Maybe she didn't expect the masons to switch and thought the mafia would win anyway, and she just wanted the game to be a bit longer.
I'm sorry for the mafia it worked out this way for them, but I really don't think everyone should be ripping on feliciano for calling it unfair. She tried her best in making the game as enjoyable as possible, but a host just can't forsee everything.
What Sputnik did is completely understandable, not against her best interests at all, and really no reason to "not trust her" in future games.