Lightlevel of some Chunks dropped to zero:
Everything was normal until I went to gather some resources (~30min), when i got back, some chunks were completly dark (lightlevel = 0) and mobs spawned in them.
Environment
Windows 10
Java 1.8.0_51 64bit
CPU Intel i7-7700HQ
GPU Nvidia GTX 1060 3GB
playing on a Server:
Server was created in 1.13.2 and upgraded to 1.14
(already played couple times on it after update)
Duplicate of MC-142134