Even if you disable Chrome's automatic sign-in in the browser's settings:
Google seems to follow you when a website offers Login with Google:
Is there a way to disable Login with Google at all for external websites?
Even if you disable Chrome's automatic sign-in in the browser's settings:
Google seems to follow you when a website offers Login with Google:
Is there a way to disable Login with Google at all for external websites?
This feature is called one-tap. Its documentation seems to be gone from the website, but StackOverflow has some points. The script in charge is https://smartlock.google.com/client. If you have an adblock extension or something like Greasemonkey, you can block it.
If you want to get rid of the button too, you can block https://apis.google.com/js/platform.js.
accounts.google.com/gsi/iframe/$subdocument
Commented
Jul 8, 2020 at 7:37
Not really sure if this is what you're referring, but I have had similar issues with inconsistencies when signing to sites with Google account, so I disabled the cookie jar/browser consistency.
I reckon perhaps this has to do with a flag in Chrome's settings - #account-consistency
Do the following to resolve:
Load
chrome://flags/#account-consistency
in the browser's address bar. Google Chrome should display the flag Identity consistency between browser and cookie jar at the top.Set the flag to disabled with a click on the menu and selecting disabled from the context menu.
Restart the Chrome browser.
Acknowledgements
Martin Brinkmann: Disable the sign-out link between Chrome, Gmail and other Google services