Hello,
Which version of the engine were you migrating from? The only change that comes to mind is:
CL#32998385 Fixed crash when landscape fixed grid vertex factory is not created : we would still create mesh batches regardless
This may not fix the issue you are seeing, but worth a shot.
We also have a known issue with experimental Virtual Height Fields, but this feature is deprecated and unlikely to be fixed:
Virtual Heightfield Mesh crash using released Vertex Factory
Have you seen similar issues with the GrassMeshBatch on the Landscape Component? Have you seen what we’re seeing with the initialization order of the PrimitiveSceneProxy’s UniformBuffer vs a child’s CreateRenderThreadResources?
We haven’t seen issues with GrassMeshBatch, the last one I found was a fix in UE 5.1 for LandscapePhysicalMaterials in CL#22240134
Hope this helps!