At a random time at night, you will see the world dark and only the blocks that emit light appear bright. That can be set back to rormal if you place a new light source down.
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Happening also during light changes at sunset (Android) shaded areas completely dark. Logging out resets or updating blocks. Things like shulker boxes can seem invisible.

Also happens when coming back to the overworld from the nether. Happens more frequently when I'm playing with my friend on my world. Everything being dark except the block my torches are on. And sometimes everything is brighter which is weird.

Antheny, that is when it happened to me!

Antheny and Yiannis, the same thing is happening to me when I return to the Overworld from the Nether. I am playing on the Xbox One version of Minecraft. The shading issue is fixed when I brake one of the shaded blocks. I have included a short video and a screenshot if it helps.
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I am playing in Android Bedrock 1.16.40.02, and have same issue with lighting, this appears always after a go to overworld from the nether
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Duplicate of MCPE-69037.