Sometimes when I'm breaking a block I can see plants and stuff through the cracks. I think it happens to every block, but doesn't happen all the time, only when (I believe) you're facing plants that can be xrayed.
This screenshot does a good job at illustrating what's going on:

Sometimes when I'm breaking a block I can see plants and stuff through the cracks. I think it happens to every block, but doesn't happen all the time, only when (I believe) you're facing plants that can be xrayed.
This screenshot does a good job at illustrating what's going on: