DeserializeDict: Unexpected non-0 padding byte `1`

There is an issue with the new Dict derive macros:

use std::error::Error;
use std::convert::TryInto;
use std::collections::HashMap;
 
use zbus::{dbus_interface, fdo};
use zvariant::OwnedValue;
use zvariant_derive::{SerializeDict, DeserializeDict, TypeDict};
 
#[derive(SerializeDict, DeserializeDict, TypeDict, Debug)]
struct Foo {
    logical_id: i32,
    online: bool,
    opt: Option<bool>,
}
 
 
struct Greeter;
 
#[dbus_interface(name = "org.zbus.MyGreeter1")]
impl Greeter {
    fn test_dict(&self, arg: Vec<HashMap<&str, OwnedValue>>) {
        dbg!(arg);
    }
    fn test_struct(&self, arg: Vec<Foo>) {
        dbg!(arg);
    }
}
 
fn main() -> Result<(), Box<dyn Error>> {
    let connection = zbus::Connection::new_session()?;
    fdo::DBusProxy::new(&connection)?.request_name(
        "org.zbus.MyGreeter",
        fdo::RequestNameFlags::ReplaceExisting.into(),
    )?;
 
    let mut object_server = zbus::ObjectServer::new(&connection);
    object_server.at(&"/org/zbus/MyGreeter".try_into()?, Greeter)?;
    loop {
        if let Err(err) = object_server.try_handle_next() {
            eprintln!("{}", err);
        }
    }
 
}

busctl --user call org.zbus.MyGreeter /org/zbus/MyGreeter org.zbus.MyGreeter1 TestStruct a\{sv\} 2 logical-id i 0 online b 1
Call failed: Unexpected non-0 padding byte `1`