Do you see the little "closed lock" icon in your web browser right next to the URL? This means that you are surfing over HTTPS and encrypting your traffic so that third parties cannot spy on most of the information you send. However, secure-looking HTTPS websites can still contain insecure HTTP forms for you to enter your passwords and other personal information. Google plans to do something about this in Chrome 86 (via 9to5Google) this October.
You're getting some big, bold warnings in the first place, according to Google's official blog post. The first one will look something like this:
And if you try to submit your information anyway, you will get a second warning: "Are you sure?"
Google also deactivates the automatic completion of these so-called "mixed forms". The fact that your password managers and autocomplete keyboards are not automatically inserted into text should be a third form of warning.
Google previously tried to alert users to this issue by removing the lock icon when it detected an HTTP form. However, the company said that "users found this experience unclear and did not effectively communicate the risks associated with submitting data in insecure forms."
To that I say: no joke. Tell me the truth: when I asked you to check out the lock icon at the top of this post, how long has it been since you last looked at it?
Chrome also added DNS-over-HTTPS in Chrome 83, which you can read a little more about here.