Discussion about querying and displaying featured posts in frontend, with some troubleshooting and guidance provided.

"selectPostOne": *[_type == "post" && references(^._id)][0]{
        ${postFields}
      },

*[_type == "movie"] {
  ...,
  "actors": actors[]{
    ...
    person->
  }
}

Object.keys(results.postReferences).map(reference => { //your function here })

Object.keys(results.postReferences).map(reference => { 
 const values = results.postReferences[reference]
})

{allCategoryMenu.map((item) => {
        console.log(item.postReferences);

        return (
          <>
            {Object.keys(item.postReferences).map((reference) => {
              const values = item.postReferences[reference];
              return (
                <>
                  <div key="{values.slug}">{values.title}</div>
                </>
              );
            })}
          </>
        );
      })}

{allCategoryMenu.map(item => {
  return (
    <>
      {Object.keys(item.postReferences).filter(Boolean).map(reference => {
        const values = item.postReferences[reference];
        return (
          <>
            <article key={values?.slug}>{values?.title}</article>
          </>
        );
      })}
    </>
  );
})}

{allCategoryMenu.map(item => {
  return (
    <>
      {Object.keys(item.postReferences).map(reference => {
        const values = item.postReferences[reference];
        if (!values.title) return null;

        return (
          <>
            <article key={values?.slug}>{values?.title}</article>
          </>
        );
      })}
    </>
  );
})}

"postReferences": [postReference1->, postReference2->, postReference3->],

{allCategoryData
  // Filter out ones with no references
  .filter(item => item.postReferences.filter(Boolean).length !== 0)
  // All these should have at least one featured reference now
  .map(item => {
    return (
      <>
        {item.postReferences.map(reference => {
          return (
            <>
              <article key={reference?.slug}>{reference.title}</article>
            </>
          );
        })}
      </>
    );
  })}