When I log in (and restart Chrome app) with my Google account into the Chrome browser I start to get the "Provisional headers are shown" warning in the web-inspector (Network tab, XHR section).
After logout this warning doesn't disappear until I manually remove Chrome folder in ~/Library/Application Support/Google.

I don't see all headers for request next to the warning label and don't see Set-Cookie header in response and Cookie header in request.

• Requests are sent, and they have response body, etc.
• All Chrome addons are turned off.
• No installed Chrome themes.
• Account settings reset to default.
• Warning is reproducible in incognito tab.
• Latest Mac OS, latest Chrome version.