Crash on Applying a Material with PN Triangles Tessellation to Large Landscape

When applying a Material with nothing in it but PN Triangles turned on to a Large Landscape, the engine will crash.

Also Reproduced in Main Promotable-CL-2513846

1. Open QAGame Editor
2. Create a New Material
3. In the Material Editor, Change the D3D11 Tessellation Mode to PN Triangles.
4. Compile and Save Material
5. Create a Landscape with the following setup:
   • Section Size = 255x255 Quads
   • Sections Per Component = 2x2 Sections
   • Number of Components = 16 x 16
   • Overall Resolution = 8161 x 8161
6. Click Fill World
7. Click Create
8. Once Landscape is created, apply the Tessellation Material as the Landscape Material

RESULTS: CRASH

EXPECTED: No Crash

Fix UE-51650

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