Pixavif found images marked as converted whose AVIF or WebP files are gone. This happens when a site is moved or restored from a backup that did not include wp-content/uploads-pixavif, or when the folder was deleted by hand or by a cleanup tool.
InfoYour pages are safe. When the folder is missing, Pixavif serves your original images. In rewrite mode the server already falls back to the original file.
Repair
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When moving a site
Copy wp-content/uploads-pixavif together with wp-content/uploads. Migration plugins that only copy the uploads folder leave it out; in that case, run Repair library on the new site.