I work as a developer of a CMS, which produces websites, powered by React. The website is prerendered and served with custom solution for GoogleBot. These days, we observed something strange - the sites are indexed in Google, but none of them has cached version in Google. My question is - how is that possible?

As I prefer not to point any domain, I will share as much data, as I can:

1. robots.txt is as simple as:

User-agent: *
Allow: /

2. There are no robots metatags;
3. The sites are managed by their own SEO teams and I guess, they take care for GSC properly;
4. The only thing that I think is out of order are the sitemaps. They are autogenerated, and their values are set by the CMS operator, but have same structure:

<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
  <url>
    <loc>https://www.example.com/en</loc>
    <changefreq>always</changefreq>
    <priority>1.0</priority>
  </url>
  ...

The only problem I suspect is point 4 where most of the records are always/hourly, with priority of 1.0. Despite in the dev docs of Google it is said they are no longer taken in mind.

Any ideas here are highly appreciated! Thank you! Anton