First, I placed myself in an ocean and made sure the the chunks at the end of the render distance were ocean as well.
Then, a short time after /time set 12900, the global lighting does a sudden shift and everything suddenly gets darker.
This is likely being caused by the sun's lighting source dipping below water level at the edge of the rendered chunks. When it passes behind blocks in the horizon, it manages to be smooth yet in oceans this happens instead.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response
Is this still an issue in the latest version? If so, can you please add it to the affected versions (or mention it if you are not the reporter).
Also, just a reminder, to make your bug report as effective as possible, please try and include the following steps to reproduce the problem:
If your ticket does not look like the example given here, then it's likely to be closed as incomplete.
This ticket will automatically reopen when you reply.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki