Stage specific shader keywords triggering errors on Vulkan editor

Steps to reproduce:

1. Create a new URP project
2. Copy the attached shader to the project
3. Select the shader and see the "undeclared identifier" shader error

Actual results: 

Shader error about the keyword being an undeclared identifier

Expected results: 

No errors

Reproducible with versions: 

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): 

Notes:

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