Images from Signed URL returns 403

Description

Images accessed with signed url results in 403 now.

Notion Test Page ID

Currently using the function below.

function getPageCover(
  pageData: ExtendedRecordMap,
  pageBlock: PageBlock
): string | null {
  const cover = pageBlock.format?.page_cover;

  if (cover) {
    if (!cover.startsWith("http")) {
      return `https://www.notion.so${cover}`;
    }

    return pageData.signed_urls[pageBlock.id];
  }

  const images = getDirectChild(pageData, "image") as ImageBlock[];
  if (images.length === 0) {
    return null;
  }
  const image = images[0];

  return pageData.signed_urls[image.id];
}

It returns signed url, such as https://file.notion.so/f/s/cceaadce-b934-4469-a976-1639abc31c16/cover_tech_blog.png?id=cdce9a22-28db-4759-b55b-3eca64d17d6d&table=block&spaceId=9b56c2e3-24a2-45c2-b3f7-92eb37529384&expirationTimestamp=1682528539982&signature=TaFx_XF7gC__IrWAbK4kn8Sf8yiT9g5IirYlzCKuEPQ

However, I cannot access those images on incognito mode.

I can provide more URLs when the above URL is expired. Please check this issue.

Start with the getPageCover function shown in the issue and reproduce access to its returned signed URL in an incognito browser. Compare the behavior for page covers and direct child images, then trace how pageData.signed_urls is populated. Done means the affected image URLs can be accessed as expected without relying on an authenticated browser session.