Nanite landscape mesh has a significant difference with normal landscape when using large Z scale value

Result : there are significant differences between the generated Nanite mesh and the original landscape mesh (see [Link Removed])

Note : the bug was originally reported on this UDN : [Link Removed]

• In the Sandbox/LDModeling/Terrain project, open  the map : LandscapeNaniteNonStandardZScaleTest

Or: 

• Create a landscape with a non-uniform scale (e.g. 100, 100, 1000)
• Sculpt some mountains
• Enable Nanite on the landscape actor

Then : 

• Make sure that the Nanite landscape data is built (Build->Landscape/Build Nanite Only)
• Switch between Nanite and non-Nanite version of the landscape and observe the difference