Fortune 3 enchantment won't work at Minecraft beta at android after testing to mine 4 diamonds

So I finally get my fortune 3 pickaxe and Im excited to mine my diamond ores which I get when mining with my silk touch diamond pickaxe

So after I mined the 6 diamond ores I only get 6 diamond ores and I got upset because how did ai get only 6 diamond with fortune 3 pickaxe. So I did a  test on my other world to test if the fortune 3 pickaxe would really work. Unfortunately it didnt (refer to the video)

 

TLDR:Fortune 3 pickaxe wont work after mining 6 diamond ores and only get 6 diamonds so I run a test and confirmed that the fortune 3 pickaxe has a bug