wix data query result differs backend from frontend

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I have a Test dataset which holds the fields “faculty”, “department” and “subject”.
I want to save the wixDataQuery to be able to call the next() function.

When I query the “Test” collection from the backend I get a different object with no “next()” function. However, doing the same thing from the frontend result an object with a next() function.

Is it possible to this from the backend? Why does it behave like this anyway?
Thanks.

  let queryFrontend = await wixData.query("Test").eq("faculty", faculty).eq("department", department).eq("subject", course).limit(30).find();
    console.log(queryFrontend);
 let queryBackend = await getTestsArrayForCourseDepartmentAndFaculty(faculty,department,course);
    console.log(queryBackend);
 /**
     * import {getTestsArrayForCourseDepartmentAndFaculty} from 'backened/getters'
     * 
     * IN BACKEND/GETTERS : 
     * 
        export  function getTestsArrayForCourseDepartmentAndFaculty(faculty,department,course) {
            return wixData.query("Test").eq("faculty", faculty).eq("department", department).eq("subject",               course).limit(30).find();
        }
     */