This deals with a current lighting bug in minecraft where it doesnt recognize that blocks that emit a light level are present and allow mobs to then spawn as well as be dark in specific regions.
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Asteraoth
Thank you for your report!
We're actually already tracking this issue at MC-142134, so we 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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