Clouds lighting often doesn't get updated properly, as shown here when switching the time from midnight to day, and then switching it to night:
Note that the same issue can occur during normal gameplay, and the /time command isn't required to reproduce this issue.
Screenshots were taken in an instance with forge 43.3.5 and BadOptimizations 1.6.3, and I had no other mods installed.
Clouds lighting often doesn't get updated properly, as shown here when switching the time from midnight to day, and then switching it to night: Note that the same issue can occur during normal gameplay, and the /time command isn't required to reproduce this issue.
Screenshots were taken in an instance with forge 43.3.5 and BadOptimizations 1.6.3, and I had no other mods installed.