Block Rendering lag when placing or destroying blocks

Whenever a block is placed or destroyed, There is about a 2-3 second delay before the blocks actually update. The Block itself is not there when destroying it, like it should do (No hitbox, but the block is still rendering).

When placing a block, there is a hitbox, but no block. Before the snapshot 14w29a, everything was all good, until they changed the way chunks are loaded