Yes, unfortunately a lot of implementations for this break password managers. It doesn't have to be that way and there are ways to fix it. But it complicates things a bit. And it's a pattern that actually gets copied a lot by products that definitely don't do any form of SSO.

Also, a typical opendid flow or SSO would not actually require an email field at all. So splitting the screens is kind of redundant in that case. E.g. a Github signin would be done with a button click and a few redirects.