Static lighting crash on 5.4 when using landscape with WPO

When static lighting is built for a landscape with "Use Material Position Offset in Static Lighting" enabled it causes an editor crash.
Licensee mentioned it was likely caused by a commit for 5.4, CL 30190260.

1. Create a level with a landscape
2. Give the landscape a material that uses WPO
3. Enable "Use Material Position Offset in Static Lighting" on the landscape
4. Bake static lighting

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