It really seems that after sunset the formation of water ice clouds is a normal phenomenon, at least at this time of year on Mars.
Here’s another example with a color photomosaic reconstructed from a French site.
HD image: http://www.db-prods.net/marsroversimages/Curiosity/2019/Sol2425_Mastcam34.jpg
Original Mastcam photos: https://mars.jpl.nasa.gov/msl/multimedia/raw/?s=2425&camera=MAST_
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