The image above, one of a total of 21 images shot over a 4 minutes span, was captured by Curiosity on June 16,2019 or sol 2438 on Mars. Only in this image a bright spot shows up, while the next and previous images from the same scene, are captured only 13 sec. before and after.
Just after the weekend when this series of images was shot, on sol 2440 it appeared that Curiosity's most recent transmission didn't come down as expected, so the rover was commanded to retransmit all the data from where it ended up after its drive that weekend.
So could the bright spot on the image have been caused by a data transmit or storage failure and could enlargement of the bright spot reveal this or the presence of a reflecting rock ?