The official conclusion was that this was a piece of airbag material from the landing that had just happened.
That official opinion was based on the proximity in time combined with the movement ‘in the light breeze’ and the yellowish coloration. They did, however, to their credit, say that it was an inconclusive finding and they couldn’t truly say exactly what it was. They kept an eye on it and it appeared next under the edge of the lander. It was not seen again, sadly.
I have always had a problem with the airbag conclusion, despite it’s theoretical plausibility. Do notice that only one “ear” moves. If it was light airbag material, would only the one move? And … how exactly would the two “ears” stand up like that? They could well be right, but to my eye —it simply doesn’t look like what they are saying— it just seems “wrong.”
Think on that a while…