Tested this earlier on Fabric 1.20.1 with version 1.1.0 of the mod.
Beavers chopped down a tree next to a river, then picked up the sapling and started trying to plant the sapling in the water (1 block deep) which, because that's not possible, the sapling kept popping back off, they'd pick it up again, and try planting again. Repeatedly. Wouldn't do anything else after that but try to obsessively plant the sapling in the water.
Tested this earlier on Fabric 1.20.1 with version 1.1.0 of the mod.
Beavers chopped down a tree next to a river, then picked up the sapling and started trying to plant the sapling in the water (1 block deep) which, because that's not possible, the sapling kept popping back off, they'd pick it up again, and try planting again. Repeatedly. Wouldn't do anything else after that but try to obsessively plant the sapling in the water.