This bug makes the OPEN fence gate texture look somewhat transparent.

This is how to "re-create" the bug:

1. Place a block. (any kind of blocks like sand, wool, wood etc. work)
2. Place a fence gate right next to the block.
3. Open the fence gate.
4. Notice how the texture becomes "transparent".

NOTE! The first TWO fence gates on the left are not bugged, but the other two that are stuck to the sand blocks are bugged :l