When you come back from the nether, there are a lot of bugs of lighting. As for example that appears in the image.
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[Mod] OcelotOnesie
Thank you for your report!
We're actually already tracking this issue at MCPE-69037, 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.
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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