I created a building by fill command, entered it and I saw the lighting model shown on the sreenshot instead of a completly dark room. Ceiling was completely covered but sunlight penetrated it. Can you tell me the reason?
(Seed: 1225524333)
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[media]

Try updating the area by placing some blocks where the glitch occurs. The /fill command currently does not update the lighting on blocks so you have to do it manually.

Duplicate of MC-55730.