Typo in NaniteRasterizer.usf preventing low tessellation mode at distance

A typo in a conditional compilation macro in NaniteRasterizer.usf causes code controlling distant tessellation reduction to never be included in final shader code. This means that the low tessellation mode (tessellation factor reduced to 25%), which should active at a distance, can never activate.

The offending code in NaniteRasterizer.usf is the following:
#if USE_DISPLACEMENT
LowTessDistance = CalcDisplacementLowTessDistance(PrimitiveData, Patches_InstanceData, NaniteView);
#endif

Note that the USE_DISPLACEMENT macro is not defined anywhere, so the contained code can never be compiled or executed. This should instead be USES_DISPLACEMENT.

• Open the engine code
• Open NaniteRasterizer.usf
• Go to line 831
• Check the #if statement
• what you get:
  #if USE_DISPLACEMENT
• expected:
  #if USES_DISPLACEMENT