dbus_interface requires zbus::fdo::Error

I tried to implement a DBus interface with the dbus_interface macro, and then return custom errors. I declared

    use zbus::DBusError;

    #[derive(DBusError, Debug)]
    #[dbus_error(prefix = "foo.Error")]
    pub enum Error {
        ZBus(zbus::Error),
        ThingsFailed(String),
    }

    pub type Result<T> = std::result::Result<T, Error>;

But attempting to use the Result as return type for a method inside a dbus_interface impl made the compiler complain about a missing From from Error to zbus::fdo::Error.

When adding that From the code compiles but the custom error type is lost; returning an error from my method ends up in a org.freedesktop.DBus.Error instead of my custom error name.

I was assuming it ought to work because Interface::call returns a generic zbus::Error, but I wasn't able to make it work, so do I understand correctly that currently we can't use custom errors with dbus_interface?

If not what am I doing wrong?