En una zona completamente cerrada, a veces ocurre este tipo de bug de iluminación.
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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.
Duplicate of MC-149518
Una vez que se guarda el mundo y sale, Se arregla