Even if Mullvad did erroneously allow applications to access your physical network connection for a moment, because you bound qbittorrent explicitly to the network device of the Mullvad VPN, qbittorrent will never use the physical connection.
You can check this out easily by disconnecting Mullvad and trying to torrent something on qbittorrent and also browsing the Net: you’ll notice the browser gets through just fine but qbittorrent will not.
Mullvad leaking would be a problem if what you’re worried about is loss of privacy or government surveillance, not for torrenting if your torrent server is correctly bound to the VPN device.
Even if Mullvad did erroneously allow applications to access your physical network connection for a moment, because you bound qbittorrent explicitly to the network device of the Mullvad VPN, qbittorrent will never use the physical connection.
You can check this out easily by disconnecting Mullvad and trying to torrent something on qbittorrent and also browsing the Net: you’ll notice the browser gets through just fine but qbittorrent will not.
Mullvad leaking would be a problem if what you’re worried about is loss of privacy or government surveillance, not for torrenting if your torrent server is correctly bound to the VPN device.