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Adding new components to a Landscape breaks Landmass

https://answers.unrealengine.com/questions/1033932/view.html#comment-1033932-form

I found another person asking the same question, sadly with no answers. Adding new components to a Landscape makes it unable to be affected by Landmass. Any existing Landmass would be flattened, and new Landmasses don’t affect the Landscape at all. Does anyone here know a fix to it?

With World Partition, it seems to me the only way to expand a Landscape is to add new components to it. There is no way to connect a new landscape to an old one without using World Composition if I’m not mistaken. If that’s the case, then it’s likely that you would want to expand a Landscape with new components, but that renders Landmass useless.