Other kinds of arrows except normal and spectral arrows are color black arrows when in creative menu.

I downloaded the Minecraft 15w31c snapshot on my Minecraft PC. I opened my Minecraft then clicked Singleplayer then clicked my Flat World. Then I was warned by my brain to get a diamond sword for a reason then when I pressed E then Combat, I saw the arrows (except normal and spectral arrows) that are in color black. Please fix this Mojang because I might be confused on the types of arrows. I hope you will see this bug. THANKS!!!