This sucks and it's brutal to even program a game to give a bonus, then upgrade and still pay 0x, but it's how those bonuses work. If you get one of the other bonuses and trigger another feature at the end you get to keep the return of both, but with the chase bonuses if you reach the end you don't get the final stepping stone prize too, you upgrade and get something different. It's the same on Rick and Morty: Wubba Lubba Dub Dub - if you reach Big Money on the Rick Rattle and Roll Bonus Chase you just get given whatever the final part awards even if it's a cash prize, because the bonus is designed that you get the final prize you land on, you don't collect each one you pass along the way. Sorry!