It depends upon the inconsistency / concern they see in "Potentially adverse info in FOSS", likely information related to your past travels / interactions with CBSA.
I would just add that if every thing is clear, such notes can be corrected without being prompted.
When i applied for PR, the case analyst wrote in notes that there is no NEW job offer in my file, so he kind of refused my app, though notes said "officer review required". But it was more blunt in the sense that he wrote "Not qualifying job offer on file", then wrote recalculated CRS score -600. So it was a plain refusal.
But some time latter, a case officer reviewed the docs again and newer notes threw out his assessment. I was already working on an LMIA job for a few years and naturally wasn't submitting a totally NEW job offer. Instead my employer gave a comprehensive experience letter stating all requirements that CIC otherwise asks for (permanent, full time, detailed role description etc.)
Bottom line, it could go either way and unfortunately there is no way to know given this info. Of course some body with more closer interaction with exact above phrase in notes (as Raj pointed out) might be more helpful. All the best