Mismatch in Landscape Layer Weights between Nanite and Non-Nanite Landscapes

Repro project is available in the additional info URL to save repro time.

Disabling Nanite on the landscape, or painting on it (which shows the non-Nanite version of the landscape) reverts the issue.

1. Open a new, blank project (which should open the default Open World template level)
2. Create a material for the landscape using a Landscape Layer Blend node with two inputs, A and B. Connect two different colors to those inputs, and connect the output of the blend node to Base Color.
3. Apply that material to the landscape
4. Enter Landscape Mode and go to the Paint tab
5. Create new LandscapeLayerInfo assets for the two layers
6. Paint most of the landscape with layer A, and paint some parts of the landscape with layer B in a recognizable pattern
7. Click on the landscape actor itself, and enable Nanite on the landscape
8. Observe a difference in how the weights are applied to the landscape.