Not to my knowledge, Freaked ...
I worked on practical training for a few months, then attended school using I-20 for a few months. Few months after that I obtained an H-1B visa and continued my work. At the time of filing the 485 petition, I didn't have even the I-20s but got a letter from the registrar that I was a student at the university for the said period. Probably, this didn't make a difference in my case because INS needs only 6 years (some one correct me if I'm wrong) worth of records at the time of 485 filing. And, the events for which I didn't have records preceded the 6 yr. period by a matter of months. None of these were questioned by VSC while approving.
A more straight-forward case would be that of my wife's. Her case is very similar to yours. Out of school, she worked on practical training for almost a year, then got her H-1B and subsequently her GC, though as a derivative beneficiary of my case.
Don't know if this helped or only fueled your worries further.