what user you are using to access the /home/qbittorrent. Using root, it’s working. As well I see the folder described on qbittorrent FAQ
root@DietPiVM1:/home/qbittorrent# ls -la
total 20
drwxr-xr-x 5 qbittorrent dietpi 4096 Mar 28 00:15 .
drwxr-xr-x 4 root root 4096 Mar 28 00:14 ..
drwxr-xr-x 3 qbittorrent dietpi 4096 Mar 28 00:15 .cache
drwxr-xr-x 3 qbittorrent dietpi 4096 Mar 28 00:14 .config
drwxr-xr-x 3 qbittorrent dietpi 4096 Mar 28 00:15 .local
root@DietPiVM1:/home/qbittorrent#
and there are the torrent files
root@DietPiVM1:/home/qbittorrent/.local/share/data/qBittorrent/BT_backup# ls -la
total 40
drwxr-xr-x 2 qbittorrent dietpi 4096 Mar 28 00:23 .
drwxr-xr-x 5 qbittorrent dietpi 4096 Mar 28 00:15 ..
-rw-r--r-- 1 qbittorrent dietpi 1100 Mar 28 00:23 672f6ba0a49b285fa79835ccd5732cc1c5bbd5bb.fastresume
-rw-r--r-- 1 qbittorrent dietpi 25570 Mar 28 00:23 672f6ba0a49b285fa79835ccd5732cc1c5bbd5bb.torrent
-rw-r--r-- 1 qbittorrent dietpi 0 Mar 28 00:15 session.lock
root@DietPiVM1:/home/qbittorrent/.local/share/data/qBittorrent/BT_backup#