I have water + landmass plugins enabled. Also got “Edit Layer” enabled.
I made a landscape with a hole to simulate a waterfall lake. When I create a Water Body Lake, it either carves a huge amount of land destroying my landscape shape, or it sculpts a huge amount of added landscape also ruining the original shape. In both cases, lots of unwanted added/destroyed land, but no signs of water. Already check and enabled “Water Content” material, and they are there.
DOn’t know what else to do 
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