Torches, lamps and other lighting sources, except for the sky, do not make dark places brighter. For example, when I was placing torches in the mansion in 1.12, it became much brighter, but doing the same in 1.13 do not make it brighter.
Linked issues
Comments 3
MCPE-58182 has a clearer description of the issue
Thank you for your report!
However, this issue is a Duplicate of MCPE-58182.
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