I’m not sure if there is a way to copy landscape from one map to another in another project. But our engineer found:
There’s a skirt value that gets set that is INF, skirt size goes to INF because of a divide by zero error. In LandscapeHLODBuilder.cpp:400 there’s a ScaleFactor computed that has ComponentSizeVerts - 1, which is zero. This is because the component resolution isn’t enough for the number of LODs. If you change the LOD of the landscape used to generate the HLOD to anything lower than 6 (which is what the auto selection picks), then this will work.