Image Transformations via Pages Function doesn't seem to work

export async function onRequestGet({ request, env }) {
    
    let options = { cf: { image: {} } };

    const imageURL = `${env.S3_PUBLIC_HOST}${url.searchParams.get("image")}`;
    const size = url.searchParams.get("size");

    switch (size) {
        case "small": options.cf.image.width = 400; break;
        case "medium": options.cf.image.width = 600; break;
        default:
            return new Response('Disallowed size', { status: 400 });
    }

    options.cf.image.quality = 80;
    options.cf.image.fit = 'scale-down';
    options.cf.image.metadata = 'copyright';

    const accept = request.headers.get("Accept");
    if (/image\/webp/.test(accept)) {
        options.cf.image.format = 'webp';
    } else {
        options.cf.image.format = 'jpg';
    }

    const imageRequest = new Request(imageURL, {
        headers: request.headers,
    });

    return fetch(imageRequest, options);
}