Hopefully this will help others, I found something that worked for me. It seems when I was working on these documents originally that XD supported displaying PSD files, and now it does not. I was able to click into the missing element shape and select the invisible image, showing as just an empty box, then I could right-click that box and select, "Edit in Photoshop", which revealed the original image. I then saved it out as a PNG, and again right-clicked the empty box and selected, "Replace Element", then selected the PNG. Since this was a component I used everywhere it fixed it everywhere.
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