Wow!! It didn't bend the rear drop out and it didn't tweak the rear derailleur pentagram

You are very lucky!! I sucked up the derailleur into the rear wheel while on a training ride out in eastern sierra between mono lake and mammoth mountain. Ended up pretzeling the rear derailleur pentagram, bent the rear drop out. It was not a fun ride back to mammoth mountain...

If you have to lay down your bike, whether out on a ride or to put it inside a car, ALWAYS lay the bike with the derailleur side up!! and NEVER stack another bike on top even if you have a thick blanket to keep the bikes from scratching each other.