I also get this. Set up project yesterday, configured as public, and haven't checked "Unlisted in search & browse". Still, the project doesn't appear in search results and, if you search my username, although I appear in the list of creators it says I have 0 projects. Pretty frustrating after spending a day debugging CORS issues to get the game to work properly when hosted in itch.io.
Specifically, the project that doesn't show up is this: https://arcadely.itch.io/star-citadel. It's an HTML5 game hosted in browser with assets uploaded as a ZIP.
You can search for it by exact name and nothing appears. Also doesn't appear in the list of recent games.
Any idea what's up?