I know someone who was working in OPT then continued working with TPS. Did not maintain F1 and never left the country, he was not asked anything about f1 during his interview. His case was approved.

I maintained both f1 and tps. Went to Nepal and came back with AP. During the AOS interview I was asked about my status. I told them my f1 visa had expired but I have been maintaining my f1 status, case was approved.