Water body breaks the landscape

Test in UE.27 and then on 5.0… still the same kind of bug. This is an landscape using a heightmap. When you drag and drop rivers, sometimes nothing happens, but the most fun thing is when you drag and drop a lake and obtain an endless ocean outside of your landscape !

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Sorry for not having a solution but rather similar problem. I drag and drop a lake and it is created in a very unreasonable and ugly shape. Using 4.27.2. Any help is appreciated.


It is still an issue in 5.3.1

Any solutions? I have this bug with some of my rivers.

My lake in UE5 has really ugly serrated edges and I can’t sculpt around it to modify the surrounding landscape. Is that something unsolvable?