I went to mine diamonds with fortune III and it only gave me 8 out of the whole 8 vein so I became suspicious and went to the nether to try and mine nether gold and it was only giving me a max of five per ore and when I was watching PythonGB mine it with fortune 3 it was giving him 14-18 per ore.
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Thank you for your report!
We're already tracking this issue at MCPE-67169, so I will resolve and link this ticket as a duplicate.
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in the beta version there are display bugs, when the blocks break they bug and they teleport and there are even times when I teleport to the areas then I die
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I can confirm this. Happened too in Windows 10 edition.