I was in the Nether and returned to the overworld. I then discovered my house was partly very dark. It was sunshine, and my house is lighted with torches.
I also discovered an incorrect light level on a nearby crop farm and below a tree.
The problem disappeared when I quit and reloaded Minecraft.
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try placing a torch then breaking it

Thats what I do to fix it

That always happens to me even if i don't go to the nether

This is a duplicate of MCPE-69037.