I’m working on a new project on Omeka S version 4.0.4. I’m using the csv import module to create Media with IIIF images. It’s mostly going smoothly, but I am baffled by inconsistent appearances of thumbnails. 95% of thumbnails will generate correctly, but then one will seemingly randomly not be generated. The image itself does appear in both the front end and backend if I go to it directly, but the thumbnail appears nowhere. Is there anything I can do to fix this?
Example of what this looks like, with images that were all ingested at the same time and have no difference in metadata: