When you enter the nether through a portal everything is fine.However,when coming out the nether the game would either get stuck in generating world or it would not load chunks around the portal in the overworld.
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[Mod] OcelotOnesie
migrated
Thank you for your report!
We're actually already tracking this issue at MCPE-44815 and MCPE-63268, 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 tickets it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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