I think this behavior results from your OS Keychain. AFAIK QtPass does not even prompt for the Master password, but only needs your decryptet Pgp private key, which it gets from your OS's Keychain/Keyring. On gnome you can set the key to "never ask for a password". Maybe it is the same for macos.
QtPass uses GPG to decrypt the password entries, on macOS it asks
To change this behaviour, open
You should now be asked for your master password when accessing QtPass password entries.
Please note that