When a player walks back from a place far away, the shadows sometimes have a very dark brightness, and so does the places with torches.
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Thank you for your report!
We're actually already tracking this issue at MCPE-39439, so we 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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Suggested search terms for JIRA desktop view: {color:#009900}mcpe unresolved light* dark* shadow*{color}
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