HLODs generate incorrectly with Substrate enabled

Happens when using multiple layers:
"Testing this further it appears that it only occurs with multiple HLOD layers. The default setup has an instanced HLOD with a merged mesh HLOD parent. If you remove the instanced HLOD layer and just use the merged HLOD the textures generate correctly.

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If you use two layers of merged HLODs the first layer will be correct and the parent layer will have black textures."

• Enable substrate and virtual textures
• Create an empty open world level (world partition)
• Add a landscape
• Build HLODs
• Observe merged hlods have plain black textures