It is absolutely NOT specific to the very limited situation you are describing, which is already a big red flag when processing applications.
"USCIS acknowledges exceptions including nonimmigrant categories with dual intent and immigrant categories where only adjustment of status provides a pathway to permanent resident status"
https://www.uscis.gov/sites/default/files/document/memos/PM-...
"USCIS acknowledges exceptions including nonimmigrant categories with dual intent and immigrant categories where only adjustment of status provides a pathway to permanent resident status"
https://www.uscis.gov/sites/default/files/document/memos/PM-...