Confirmed. Posting a Giphy of my instance in action:
http://i.giphy.com/l0O9x96Kd5orlirrG.gif
Confirmed as being in 14w30c. Just as before, it is the last two pistons only: all others do not enter a quasi-connected BUD state.
Replacing every other block with an upside-down slab (leaving the full blocks above the pistons) solves this problem, so it seems to be the classic diagonal BUD, but power-level dependent.
Sorry for the delay, I was cooking.
I will test tonight, within 4 hours. I haven't checked the latest snapshots.
Confirmed. Seems to be the North and East sides of the bed that are messed up.
I cannot confirm or deny whether this happens on local worlds. I only play MCPE on a Realms server. I can confirm that this has occurred on the server when I was the only player logged in, and that it was reproducible there. I am not the server host so I can't give much details, but we play with cheats turned off, and I believe it is on normal difficulty.
PS, does this count as a reply? I don't see any reply button or threading options