The crossover is fake:
1. Just search in Google. There are no news talking about both animations.
2. If a crossover is gonna be made, why haven't the creators talked about it in Twitter or another social networks?
3. Is the resource page a trustworthy post? I don't see de CN icon in the image. Why should I trust in a image which could have been made by anyone?
4. Cartoon Network has been working in excellent cartoons. Steven Universe is the current best example. Adventure Time, regardless of its horrible episodes, stills being one of the most ambitious CN projects. Regular Shows is a cool cartoon as well. Uncle Grandpa is even funny and fine. It's not the big deal, but has a lot of undeserved haters.
I can understand that TTG & PPG 2016 are a trash. However, CN is going in a very good way, whith admirable efforts.
So, be careful of what are you posting. Remember to verify the credibility of the topic