I experience this as well with the default textures. Strangely it only happens in one direction. (ie: blocks leftmost to a 3x3 door are fine but the connecting blocks on the right are bugged.
http://imgur.com/tmgBbnP,b7lAatz,bn75nCw#0
first and third image. Corners are bugged too. Not only in the latest dev. Uploaded 22th January