When you are on creative mode, and when you take a sword in your hand, when you click on block, it doesn't destroid. But, when you stay clicked on a double tallgrass, on the upper block, they are a bad texture.
And when you do a right-click on the upper block, they are another texture.
Environment
Windows 10 64 bits
Ram 4 Go
Intel core i3
This issue duplicates MC-1874.