So, I just downloaded the snapshot. I create a new world and run into an invisible block. It stops me from moving but doesn't appear. You can see this in the images below. Happens both in Survival And Creative mode. When reentering the world, the blocks appear as normal until new chunks are generated.
What I expected to happen was...:
Blocks to appear as normal.
What actually happened was...:
Blocks are invisible.
Steps to Reproduce:
1. Create a new world
2. Explore a bit
3. Notice that blocks are invisible
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Duplicate of MC-5737, please use the search function to see if your bug has already been submitted. Currently over 42% of tickets are being closed as duplicate.

I had the same thing happen with some NPC villages in super flat. Half of the some of the houses were invisible and right clicking on them with a block updated them.