Immich not generating thumbnails for external library JPG images

I have imported ~5GiB of photos from a drone that I used to use, and Immich doesn't seem to want to generate thumbnails/previews for them. I have tried rescanning all libraries, regenerating thumbnails for all media, and using the "Refresh Thumbnails" button for individual images, but the images still error out. If I enable "Display original photos", the images then show up when I click on them (still no thumbnails), and the images download and open fine normally in either scenario.
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