As I don't want to infringe on anyones copyrights, the photos can be found at www.space.com/12796-photos-apollo-moon-landing-sites-lro.html The LEM shadow looks rounded with a longer protrusion resembling an antenna, possibly. Looks like the full LEM.
Looking at the LM itself, I think I can see the hole in the centre of the descent stage over the descent stage. Normally this would have been covered by Kapton, but the exhaust of the ascent stage lift off likely blew it away.
Also, looking closely at your 'rounded shadow' I believe I can see a brighter area in the shadow.
This makes me think it might be the shadow v shaped things (they have a name, but I admit it is unknown to me) sticking from the descent stage seen here on
Apollo 17. And before you ask, the camera was mounted on the rover and remote controlled from Mission Control.
Admittedly, this is uneducated hypothesizing and musing on my part, I am not a professional or even particularly skilled amateur image analyst.
These are my thoughts and mine alone.
If I am wrong, I am wrong and find no shame in it but only a chance to learn.