[bug] epub conversion - books not added as they already exist in the database

[davidancalagon]

Upon running the "Convert Library to epub" function from the web interface, CWA converts all of the non-epub books in my library to epub, saves a copy of the newly-converted files in the "imported" folder, but does not transfer them to the calibre-library folder where all of the books in my library exist. Instead, I get the following error with 99% of them:

"The following books were not added as they already exist in the database (see --duplicates option or --automerge option)"

All folder permissions are set to the same user as PUID and PGID in the docker ENV variables, so it's not a permissions issue. It seems to be an issue with the calibre db itself.