Fishing bobber is black

I downloaded Minecraft pe and i play survival more so i tried making a fishing rod. When i did i cast the line and found that fishing bobber was black in colour. I tried it on my brothers tablet. His tablet is Samsung tab S and the fishing bobber was coloured there. Im using i ball slide (3g774i).
Guide to producing the bug:-
1.You need an i ball slide tablet and have minecraft installed.
2. Cast the fishing line
3. Instead of a coloured cubic bobber it will bw black.
Pls fix