i went into a box of wool with a little hole and patched up the hole but the light was still there as if i never closed it off and when i was underground in creative mode i could see clearly as if i had night vision so i went in survival mode and i still saw clearly then i changed my brightness up and then put it back to bright and then it was dark like it should have been
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I think your brightness setting was above the maximum amount, it must be a bug in options.