When you put a Fence Gate between a Fence and an other bloc (dirt or stone for instance in my experience), the Fence gate texture is missing on a side (looking from the other bloc, "in" the gate).
Hope it will be solve even though it's a minor bug 🙂
Sorry for my frenchie english ^^'
Environment
java 64 bits (windows 7)
Yes this happens for me, also if you place the fence gate between two normal blocks then the gate texture is missing on both sides.