When I was placing a few pistons fast I noticed that they were appearing not to be there (Pic 1). I have seen this bug a few times before in earlier snapshots but not in the latest one (14w31a). When I updated one of the pistons they all came back (Pic 2).
I was playing in creative on a default world.
(Generated in MC 14w31a)
Environment
OS= Windows 8.1 OS version= 6.3
Java version= 1.8.0_05
Opengl Vendor= ATI Technologies Inc. Opengl Version= 4.2.12422 Compatibility Profile Context 13.152.1.1000
Dupe of MC-62166