When I was testing a texture pack I was making I went into survival and broke a bed, but I noticed that the bed's break animation was off on both the top and bottom.
Environment
Windows 7 Home Premium 64-bit
Java 1.8.0_51 64-bit
NVIDIA GeForce GTX 1070 (used, DVI out)
1680x1050 display
Quad-core AMD A8-5500 (w/ Radeon Graphics (unused))
The texture pack was not in use when taking this screenshot.