When loading into any world (new or existing), the world only load into the "Generating World" screen. Usually, if you switch global resources, it will work. But sometimes, it dosen't work too. And once you exit the world, you need to force quit Minecraft and reload it to join that other world. Funny thing is, it dosent apply to servers.
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Thank you for your report!
We're actually already tracking this issue at MCPE-106349, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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