Google search console, all sitemaps in one, google find only first sitemap

i have a site with many urls.. I have 1400 sitemaps x 50000 urls/sitemap. So to post it to google, i create a new sitemap with these 1400 sitemaps. The problem is: Google read the file but see only the 1st sitemap..

The link of xml file is kentriko.xml

Thank you guys!