When unloading and then reloading chunks the light levels on chunk borders will become wacky and dark even if a torch is close by. It fixes itself once the effected area receives a block update. This has happened on both my IOS 13 device and my Xbox 1 on realms and in single player worlds. This has happened ever since the buzzy bees update and has continued.
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We're tracking this issue in MCPE-58182, so this ticket is being resolved and linked as a duplicate.
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This issue was fixed in a previous version (I think 15.x). The illumination did not carry over the chunk borders. Seems like the bug is back