Redirected to an error page on refresh

[ntelkedzhiev]

Can someone explain the code below?

await BP.map(alternativeLanguages, async (lng) => {
    const localePage = await generatePage({
      language: lng,
      path: `${lng}${page.path}`,
      routed: true
    });
    const regexp = new RegExp('/404/?$');
    if (regexp.test(localePage.path)) {
      localePage.matchPath = `/${lng}/*`;
    }
    createPage(localePage);
  });

When I upload my site to an AWS S3 bucket, it results in the following policy (and I'm redirected to /[LANG]/404 every time I refresh a page).

    {
        "Condition": {
            "KeyPrefixEquals": "en/"
        },
        "Redirect": {
            "HttpRedirectCode": "302",
            "ReplaceKeyWith": "en/404"
        }
    },
    {
        "Condition": {
            "KeyPrefixEquals": "bg/"
        },
        "Redirect": {
            "HttpRedirectCode": "302",
            "ReplaceKeyWith": "bg/404"
        }
    },