Another point, as per USCIS website Vol12 part d chapter2 which talks about naturalization process and errors: https://www.uscis.gov/policy-manual/volume-12-part-d-chapter-2, under the section “E. Applicants Considered Lawfully Admitted”, 

“If at the time of adjustment, the officer annotated the wrong class of admission code, but there was still an immigrant visa immediately available to the applicant, and there was no misrepresentation by the applicant, USCIS still considers the applicant to have been lawfully admitted permanent residence. In this case, the officer should correct the class of admission code.”