Board Thread:Bug Reports/@comment-28687263-20170120030410/@comment-25565811-20170120114149

I think, this is a Optifine bug. Do you use this Mod? Might also be vanilla.

It happens, when you put up a torch and break it. You can remove this, by pressing f3. Then check the  (block light) value for it. Move to the place, where it shows the highest value (should be 14 or 15, not sure about this). Place a torch there. Break it again. The strage light patch is gone.