Updating last-modified Tags in Sitemaps – How to Fix?

Hello everyone,

I’m currently trying to understand the mechanics of sitemaps. When I look at the sitemap overview page (e.g., bitcoin-2go.de/sitemaps.xml), I notice that the sitemaps-tags.xml file shows an update in the last modified attribute whenever a new post is published and assigned a tag.

This makes sense, as a new post has been added to the tag, thus updating the tag overview page. However, when I click on the actual sitemap (e.g., bitcoin-2go.de/sitemaps-tags.xml), I don’t see any change in the last-modified attribute.

Additionally, I’ve noticed that the actual tag pages don’t have a meta tag for modified_at or published. The JSON-LD markup also lacks this information.

Can anyone provide further insight into why this is happening and how I might be able to fix it?