Google Search Status Dashboard showed processing status for XML sitemaps was still being resolved with nothing to announce.
John Mueller of Google posted on Mastodon explaining reasons for splitting an XML sitemap file.
A guide on submitting a sitemap to Google in three steps was published by Semrush.
Google published a help document explaining why it may not use a submitted sitemap.
A best practices guide for submitting a website to search engines was published by Hostinger.