How to get rid of feed errors (RSS)?

Question

RSS

Experts, please suggest what needs to be removed or added in this feed so that there is not a single mistake at all? The same goes for this feed . The first is native, WordPress, designed mainly for Google news. The second one was made using the Yandex.News Feed by Teplitsa plugin and, accordingly, should be subsequently "fed" to Rambler and Yandex News. I’ll say in advance that in the support of the plugin on this issue they either shrug their shoulders or are stupidly silent.