I have not tested with any other crop but carrots, but carrot farmers do not effectively harvest carrots as they are supposed to. I noticed this when I was trying to create a automatic carrot farm when the villagers would leave all the fully grown crops untouched and never re-planted them. Thanks.
Thank you for your report!
We're actually already tracking this issue at MCPE-80084, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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