Question regarding conforming landscapes to spline in UE5+

There seem to have been significant changes in landscapes between UE4 and UE5. I have a problem, in UE4 I was able to get a landscape to conform to a spline. In UE5 I am unable to get a landscape to conform to a spline. The blueprint compiles fine, but nothing happens, it does not work. I suspect the answer is buried somewhere in the C++ that goes into landscapes. Can anyone help? Thank you!