I’ve noticed the same issue with a regular release. Saved signon’s most often do not work. Disqus for example. Twitch, Facebook, youtube,… none of those are working with it enabled.
I’m in version 1.21.77 on macOS and experiencing this too. I’m finding Brave faster than Chrome right now and hoping that lasts, but I recall the reason I previously switched back to Chrome was because I have to click in a username/password field in order to select the credentials for the website before I can sign in.
Auto Sign-in would be great but I would also be cool with one-click sign-in, meaning that my info gets filled in automatically when I load a page and I just have to click the login button.