When you reach a new level and restart the game, the game will put you back on that level you reached and will refresh the powerups and also refresh the entire level below into a whole new level, it also revives the chicken if your chicken has died before and you're playing as muffin. I'd imagine this to be banned on chicken% as it ruins the whole purpose of that category as you can revive the chicken right before the final boss

This may be a glitch because I also got it in the past and for me it looks like not intended so its banned wouldn't recommend it also because of not being that useful because the game is just 80% RNG anyways