Using Mullvad (2023.2) split tunnel on my Windows 11 machine with qBittorrent 4.5.2. Every IP tool I know of is showing only my Mullvad IP. What tool are you using that indicates a leak of your real IP?
Mullvad was set to use wireguard. qbittorrent set to use only the mullvad adapter. qbittorrent log showed that it's listening to that adapters ip but found that external ip was mine (upnp was turned off). Then I checked with https://ipleak.net/ torrent address detector. and it also showed my real ip.
Has this been reported to Mullvad?