Material with Custom Expression at Vertex Shader Stage Does Not Compile

When Custom expression is connected to custom UV then material wont compile. This is working as expected in 4.22 CL# 7053642

Found in 4.23 CL#7321677 and 4.24 CL# 7321677

This is a regression.

1. Open the attached project
2. Open the material in the content browser

Results: 
The material will fail to compile with the error [SM5] /Engine/Generated/Material.ush(1873,18-46):  error X3004: undeclared identifier 'CustomExpression0'

Expected:
The material would compile 

Fix UE-51650

UE-81742 DXGI_ERROR_INVALID_CALL

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