I got this error today on Google Search console.
After navigating to my site url example.com/index_sitemap.xml it got a couple of 404 errors. So I did the permalink update and it came back, The sitemap however appears to have errors after listing on Google search console. I have tried the solutions offered by RankMath and they are not working for me. The other sitemaps listed on the index_sitemap.xml appears to be working just fine.
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