En una zona completamente cerrada, a veces ocurre este tipo de bug de iluminación.
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Una vez que se guarda el mundo y sale, Se arregla
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I got the same issue while playing on a 1.14.1 Multiplayer server (this has nothing to do with the server)
All my caves are dark, even though there are torches lighting them up beforehand and mobs are spawning in the dark spots where the torches are supposed to light up the space.
violine1101
Duplicate of MC-149518