Using the .NET SDK 10.2.5, I'm creating PictureMarkerSymbols to display a placemark style graphics. I'm setting the images for these using SetSourceAsync. I'm finding that frequently some of the images are not loading properly/are missing (like in the image on the left).
Out of say 100 graphics, that have 100 different images, maybe 50% will load correctly. The underlying images are there (you can see from the popup), but it's random how many of the PictureMarkerSymbols fail to load their picture and which particular images they are.