Empty variables result in errors and default not working?

[Attacler]

liquid-rust version: 0.26.9
rust version: rustc 1.82.0
OS: Windows

If i pass in an empty object but the template tries to read the variable, it will crash.
Reproduction of my issue:

pub fn render_template(template: String, globals: liquid::Object) -> String{
    let template = liquid::ParserBuilder::with_stdlib()
        .build()
        .unwrap()
        .parse(&template)
        .unwrap();

    let output = template.render(&globals).unwrap();

    return output;
}

render_template(
   "Liquid! {{ product_price | default: 2.99 }}".to_string(),
   liquid::Object::new(),
);

The error:

called `Result::unwrap()` on an `Err` value: Error { inner: InnerError { msg: "Unknown variable", user_backtrace: [Trace { trace: None, context: [("requested variable", "product_price")] }], cause: None } }note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Maybe i missed something but shouldent the output be the default value?
As stated on https://liquidjs.com/filters/default.html
Also, if the variable isnt there and default is not provided, shouldent there be nothing at all instead of crashing?

I might be in the wrong, so please correct me if i am!