calibre: broken restore on Trixie

I took a backup on Bookworm and restored it on Trixie. Open any library returns:

Failed to load books from calibre library, with error:
Failed to communicate with "/calibre/interface-data/books-init?library_id=Library&sort=timestamp.desc&1742233281685", with status: [404 (error)]

Library 'Library' not found

After removing DynamicUser=yes from calibre-server-freedombox.service calibre is back to normal. We should probably use a static rootless user to own the user files instead of dynamic user.