Did some more testing in 14w32d to reproduce the bug with just block placement:
https://www.youtube.com/watch?v=nD4Z0JLWjzY
Here's a clip showing it in 14w32b with pistons and slimeblocks:
https://www.youtube.com/watch?v=DAALPKTeuR4
Notice the blocks disappearing when interacting with player and appearing on update (even when the cloud goes through it at the end).
Confirmed that it still exists in 14w33a. Here is a video with trap doors as bug trigger that shows it only triggers when player is moving in the same block that's being updated: https://www.youtube.com/watch?v=SeuqVy8_FD8
I tested a bit more without capturing and can reproduce the bug without standing in the block as long as i move whatever way while opening and closing the trap door. That is strafing, jumping, walking towards, away, etc. But I have to move, if I just move the mouse looking around while clicking it doesn't trigger.