Last night I was casually streaming getting the good ending in FNaF 3 on Twitch and I died on night 5 after completing all the minigames. When it went back to the menu, all three stars were already there. Would that make it where you don't have to beat Night 5 since as soon as you beat the final minigame for the good ending (Marionette Game) you get the third star?

But you don't really get the ending so it doesn't count.