When Farmer villagers go to do their harvesting, they will occasionally be frozen into place when the crop they need to harvest is on the opposite side of the water separating the two sides.
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I saw a similar report, however it was marked as resolved. Not sure wether or not this is a reoccurring bug, or a very similar one.
[Mod] OcelotOnesie
We're tracking this issue at MCPE-166344, so I will resolve and link this ticket as a duplicate.