There is a bug in the lighting, which affects the world and the nether (16.0.0.55 and 16.0.0.57).
I had to report this bug again, since I can't report several at once.
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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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