while farming potatoes, carrots, and wheat (I haven't tried beetroot) there's a small chance that while harvesting, one of your items being replanted will instantly grow to full harvest after planting. It happens about 1/15 times and can't replicate it on purpose, only a small chance of it happening.
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This is the same for Android.

Thank you for your report!
We're actually already tracking this issue at MCPE-65291, 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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