In current Bedrock version I experience issue described here: [MC-148359] Random Dark Shadow areas - Jira (mojang.com) - apparently fixed in past versions. Shadows can be sometimes diffused by placing lantern or destroying a block (I understand it forces recreation of light), however some are persistent.
This issue is present on my Realms world.
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[Mod] EVGENSYPERPRO
migrated
Thank you for your report!
We're tracking this issue in MCPE-39439, so this ticket is being resolved and linked 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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