When light is cast onto any wall that meets with a ceiling or a floor, it looks like smooth lighting has been turned off. Screenshots included. (Sorry if this is a duplicate, I searched for "lighting" and all the bugs that came up were either fixed or for an older version of Minecraft...)
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-148689, which is a report that has not been resolved yet.
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