Rendering empty chunks/cubes in 14w29b (or number of rendered chunks on debug screen (C) is wrong)

In 14w29b MInecraft will render all cchunks/cubes, even the empty ones. I attached some screenshots (14w29a and 14w29b).

In 14w29a "C" is much lower, and increases when I place blocks in prevoiusly empty chunks/cubes. In 14w29b it's constant (when there are no chunk updates).

Enabling/Disabling VBOs makes no difference.