You'll notice
Artifact 'file not found' error message simplified, no longer offers to build an HTML page from a markdown sibling
What
The helper that builds the "file not found" hint for artifacts was simplified. It now either returns a short "Did you mean X?" suggestion, based on filename similarity or a matching .html/.htm sibling file, or returns nothing at all. The previous, longer message text and the special-case suggestion to auto-author an HTML page from a markdown sibling file have been dropped.
Why
This makes the "file not found" message shorter and more focused on a direct filename suggestion, removing a more elaborate but narrower behavior around markdown-to-HTML suggestions.