Light not recalculating over chunk borders
What I expected to happen was...:
All surrounding solid blocks to change light level
What actually happened was...:
Lighting fails to recompute over a chunk border
Steps to Reproduce:
Build a redstone flashing lamp one side of a chunk border and a solid block on the other.
disable day night cycle
set time from 6000 to 18000 and simple lighting fails to recompute the light level of the solid block in the next chunk.
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Testing the way outlined in your report does not reproduce the issue for me, please produce more detailed instructions, potentially even a world download.
Added 2 video clips, can offer backup of world via google drive if needed.

Duplicate of MC-172980