I think I see the issue, https://dev.epicgames.com/robots.txt leads to different sitemaps, and some are broken. The cpp api one linked inside https://dev.epicgames.com/documentation/sitemap.xml is broken and doesn’t load:
And the whole sitemap file at https://dev.epicgames.com/sitemap seems to show as corrupted xml compared to the other sitemaps (the others also have .xml extensions and this one is delivered with the wrong content type for xml if you go into chrome dev tools and check the content type vs the other .xml ones)
(edit: now the cpp API one is loading for me)
And another example I just ran into, this time not the autogenerated C++ or blueprint node docs:
If I search Google for “unreal oodle network compression,” the primary documentation page on it is nowhere in the first five pages of results: https://dev.epicgames.com/documentation/en-us/unreal-engine/oodle-network
Another example: search for “unreal alembic file importer”; none of the first pages of results give what you would expect as the first result: Alembic File Importer in Unreal Engine | Unreal Engine 5.4 Documentation | Epic Developer Community