When I tried to create a world with data packs the world would not create successfully. Then I tried to upload a single player world and it wouldn't verify the world successfully and gave a 504 error. I then tried to create a world without data packs and it said an error occurred. I was then unable to switch worlds as it tried to switch for 10+ minutes so I cancelled it and was able to load an adventure, but when I reset the world by uploading a different world i got the same 504 error. I have tried on different networks, and realms. I even had my friend try on his realm with the same data packs and then the same stuff started happening to him.
Thank you for your report!
We're tracking this issue in https://report.bugs.mojang.com/servicedesk/customer/portal/2/REALMS-12617 , so this ticket is being resolved and linked as a duplicate.
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