Do you have any evidence of what you claim?

Anyhow, based on what I've seen, when you go into incognito mode it definitely doesn't use your profile when you go to Google services. Search results, suggestions, etc... are different. In fact, one of the use cases for incognito is using a different Google profile on a someone else's or a public computer. Keeping contextual search results from the 'main' profile logged into the browser would be counterproductive...