[Bug] The loader will return the incorrect number of scopes when there is a schema present

[Peefy]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

Write the following unit test in the loader crate

#[macro_export]
macro_rules! load_package_scopes_snapshot {
    ($name:ident, $src:expr) => {
        #[test]
        fn $name() {
            let p = load_packages(&LoadPackageOptions {
                paths: vec!["test.k".to_string()],
                load_opts: Some(LoadProgramOptions {
                    k_code_list: vec![$src.to_string()],
                    ..Default::default()
                }),
                load_builtin: false,
                ..Default::default()
            })
            .unwrap();
            insta::assert_snapshot!(format!("{:#?}", p.scopes.get(&p.pkg_scope_map["__main__"]).unwrap().children));
        }
    };
}

load_package_scopes_snapshot! {schema_scope_0, r#"opt = option
schema Person:
    name: str
    age: int

p = Person {
    name: "Alice"
    age: 18
}
"#}

2. What did you expect to see? (Required)

The length of children is 2

3. What did you see instead (Required)

The length of children is 2

4. What is your KCL components version? (Required)

Version: 0.9.0-c020ab3eb4b9179219d6837a57f5d323
Platform: aarch64-apple-darwin
GitCommit: fdd797ac59b2b0a5259cafdf8850a0f6abbc2fce