While building an enclosed aquarium for my map, I noticed that the new Light Bulbs were appearing on the glass. I switched into adventure mode and they were still visible. I noticed that they appear if you are looking through at least one side of glass but did not show up while looking through just the water. Also, for reference, I had placed the power 15 light bulbs, but what was showing through the glass was a power 0 light bulb.

I use an Apple IPad Air.

Edit: Also noticed that coral and barrier blocks show up also.