When the load terrain screen comes up the game crashes after a few seconds. ( Going from overworld to nether) Update. I noticed that global resources failed to load. So I turned to the wifi to allow any resource packs to update. Seems to have fixed it.
Thank you for your report!
We're actually already tracking this issue at MCPE-66678, so I resolved and linked 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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