Most of the books are EPUB.
Some are PDF, but most of the PDF have covers.
All the books have green checkmarks.
Manually downloading each book with a missing cover again is not practical since we are talking about a couple thousand books. I did it manually for the books I'm actively reading or soon to read, but for the whole library it would be crazy.
I tried adding a custom column called "Extra". Then removed the custom column. Then did a connect with sync books.
It took a long time because it re-downloaded all the meta data.
That fixed it, it now has covers for all books.
If you ever want to investigate, I can probably reproduce it by erasing the SD card, and doing a database clean and book sync.
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