The fact that it landed upright made me wonder if the blade already had a small crack forming where it is thinner (towards the opposite side of rotation) but wa

The fact that it landed upright made me wonder if the blade already had a small crack forming where it is thinner (towards the opposite side of rotation) but was kept in place during its last flight, then Ingenuity landed and an electronic brake was triggered to recover some power to recharge the batteries. At this point the partially cracked blade because of its momentum got an opposite force that widened the crack until the blade was being torn away. Could make some sense, although there are so many ifs to satisfy.