Shader compilation error occurs when using values sampled from texture for Customized UV1

Shader compilation error occurs when using values sampled from texture for Customized UV1.　No problem when connected to Customized UV0.

This problem compiles well if I change the value of Const to Parameter as a workaround.
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1. Create a Material and Set the number of Customized UVs to 2 or more.

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2. An error occurs when connecting the value of the sampled texture to CustomizedUV1.

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[SM5] /Engine/Generated/Material.ush(2308,29-34): error X3004: undeclared identifier 'Local1'

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