You can view strange lines in the world

Looks like they come from torches in your game. Check your graphic cards options maybe or try to change the quality in the game options. Maybe anti aliasing causes that. (I had lines between every row of blocks a year ago as anti-aliasing got a strange setting)

I'm not sure if its related, but I am also seeing lines on torches in this snapshot, likely due to the new texture setup. I included a picture of it.

Have the same problem in lava when i am playing on fullscreen. (And on the Screenshots we can see that the Bug isnt caused by torches)

Duplicate of MC-6269