I have a small mechanism to place rail on soulsand and then removes them both. I had one that had been created before 1.4 and it still works well even in 1.4.5.
I tried to make a new one in 1.4.5 but it does not work like the one that had been created before 1.4. This one makes the piston on the left get activated a second time, breaking the rails.
here is a video showing the bug: https://www.youtube.com/watch?v=5SwOVF2mKnk (sorry, but my recording software is broken)
EDIT: i have just tested this in the 4 possible orientations, the only one that does not seem to work is EAST: http://i.imgur.com/riA80.png
EDIT 2: i tried all 4 directions again, and now west didnt work 😞
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i have tried the same exact design in all 4 directions, sometimes east doesnt work, sometimes it does. sometimes west doesnt work, sometimes it does.
have you looked if you are on chunk borders because maybe that's what causes it.
PS
?Activatation Bug? Activation not Activitation
Duplicate of MC-4052.
I think that it could be because of the block update rule unless all the tests had exactly the same layout. With this layout i can't see any possible block update but i will try to recreate it.