Lava has texture and behavior of water (singleplayer)

Lava in a singleplayer world appears to take the texture of water. Using a lava bucket plays the sound of placing water rather than placing lava. Water flowing over lava or the opposite does not create cobblestone or obsidian. Instead, it acts like they are the same fluid. Water can even be placed in the nether. The flow rate and particles/sound effects of lava are still normal.