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I think your LO is correct that this won't be an issue. Each lender can come up with their own work history requirements. But the fact you're just out of college and already past 12 months I don't think it will be an issue
Generally they require at least 2 pay stubs. They might also do another employment verification to confirm it's not a temporary job or pay increase.
Did you receive an offer letter which outlines your comp package? That can be included as documentation, and particularly effective if your employer is reputable and financially solid.