I've only seen this happen when leaving the nether, but it may be happening elsewhere. Once I return to the overworld from the nether, some of my light sources no longer cast appropriately
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That's Right, I have the same Bug

Thank you for your report!
We're actually already tracking this issue at MCPE-69037, so I 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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