[MCPE-51520] Marketplace Worlds Don't Work after 1.12.1 update

Mod Note

Update #2 from @Quinn Richter

Had a bit of a Marketplace services issue, but it's been fully resolved now. If you're still having issues to logout and back into your xbox account

https://twitter.com/quinnrichter/status/1169439244219113472?s=20

Update #1 from @MojangStatus
Bedrock: Some players may be having issues loading/playing Marketplace content. We are investigating the issue & will update to let you know when it is fixed. - HZ
https://twitter.com/MojangStatus/status/1169406413992550400

I was trying to join my Minecraft world that I got from the marketplace, but it doesn't work. It keeps on saying "There was a problem loading this world." I tried opening a different world on the marketplace that I have, but the same error message appeared. I tried a lot of other marketplace worlds and they were also broken. The worlds I created were fine and were loading in.

For some reason, the marketplace worlds loaded for me yesterday and not today.