I originated a random survival world and switched into Creative mode. (Seed -5004730293955570567)
I flew to the location x: 197 y:65 z: 319. I began using the new items (redstone block and comparator). When I went to place a block it would update as a wood block and it became apparent there was an invisible stack that was supposed to be a tree that had not appeared.

*What I expected to happen was when I placed a block it would place normallyr l appeaike usual.

*What actually happened was when I placed the block it would update and instead of having the block I was trying to place it would show a wood block. I would then destroy it as usual however there were other blocks there and they were also invisible wood blocks that would inhibit movement.

Steps to Reproduce:
1. Spawn a new world in the snapshot using the seed -5004730293955570567 and have cheats on and the bonus chest active.
2. Fly at full speed to X: 197 y: 65 z:319 and look for free floating vines
3. Run around attempting to place stone blocks or any block for that matter and waiting for one to be placed as a wood block or until you are inhibited in movement.