When we placed torches, then stopped the server by command /stop, and the next day started the server again, light glitches appeared like this. Mobs ignore the torches and they still spawning at night.
Environment
CPU: i7-4510U 2.0GHz / 2.60GHz boost
RAM: 8GB
GPU: 840M
Driver: Nvidia 417.35
Java: 1.8.0_51 64Bit
Allocated mem: 2GB
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However, this issue is a Duplicate of MC-142134.
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