Steps to reproduce:

1. Create a new Unity project
2. Create a new unlit shader
3. Create an include file with "#pragma vertex vert" in it.
4. Remove the said line from the shader and replace with '#include "<path/to/include>"'
5. Select the shader and check the inspector

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Actual results: 
Shader warnings appear
Expected results: 
No shader warnings appear

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Reproducible with versions: 
2022.3.25f1, 2021.3.38f1
Not reproducible with versions: 
2022.3.24f1, 2021.3.37f1

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Tested on (OS): 
Mac OS Sonoma