When in the NETHER, using a silk touch diamond pickaxe, I broke a Shulker box I had put down and it disappeared. I then broke the ender chest the Shulker box came out of with the same pickaxe and it completely disappeared. I started tunneling and noticed that the blocks I was breaking werent dropping anything. They were the regular red NETHER blocks and I still had the silk touch diamond pickaxe equipped. I went to the overworld and nothing would drop when a broke blocks there also. I uninstalled and reinstalled minecraft on my phone and the problem is still there.