After testing how fortune interacts, it seems that it matches up to java very well with the exception of nether wart. Fortune does not affect it at all. My attempts with a fortune III tool and without one always give a max of four nether wart.
MCPE-49050
Nether wart does not yield more drops with fortune enchant
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Thank you for your report!
However, this issue is a Duplicate of MCPE-31107.
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