Like some of the other updates, the fortune enchantment on the pickaxe is not giving any extra drops. I have tested this on multiple world's and mines and it's as if the enchantment isn't even there.
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Thank you for your report!
We're actually already tracking this issue at MCPE-67169, so I will resolve and link this ticket as a duplicate.
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Same here - one to one ratio always as if not enchanted.