Okay, so, here’s the answer to the solution. I already had the proper packages, of course, and there was no problem with Dolphin creating thumbnails in Wayland. Somehow, while running X, if one uses Oxygen theming, Dolphin can’t generate thumbnails. I’m not sure what the fundamental problem is, but it’s worth noting I suppose if someone else runs into this problem while using X and Oxygen theming in Plasma.
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