Won many Episode Races and didn't get gold bars. And there is no color bomb in the Rainbow Streak

This stripped-down version of the Rainbow Streak popped up on me recently too. I had logged out of Facebook in the game and then logged back in. That's when this version appeared. After I logged out and logged in again, the original version was back. You could try this once if you're connected to Facebook.

It looks different in the upper right corner, you are clearly in a test group. There is nothing you can do about it, just wait and see.

I believe the studio canceled the race at the same time as BGH returned. So, we all have to wait and see. 🤷‍♂️