When removing a torrent with “Also remove the content files” instead of deleting the files it moves to .Trash-ID, even on headless/docker systems.
Set to delete files: Settings -> Advanced -> Torrent content removing mode: Delete files permanently
Issue https://github.com/qbittorrent/qBittorrent/issues/21497
PS: There’s a pull request to revert back to delete https://github.com/qbittorrent/qBittorrent/pull/21528
you could always symlink .Trash to /dev/null if you don’t care about potential accidents