I've been working on cars and trucks for 30+ years and have lifted many off the ground by the frame, meaning the axles/suspension was at full droop. This includes working at a automotive test facility that usually had at least 2-4 cars on lifts at a time. Don't think I have ever seen a factory vehicle where the springs fell out or came loose, assuming something wasn't broke.
There is a chance that if the shocks were longer than stock it would let the suspension droop more than normal. I put new lift springs on my '16 several years ago and I had to remove the shocks, disconnect the swaybar, and disconnect the trackbar to get it to droop far enough....and still had to pry the stock springs out.