Assuming you mean that Bitwarden doesn't always show up when you go to type in a user name or password then in my experience that is just a thing with Bitwarden. It is frustrating though. I've found that sometimes closing the app out my recent apps and reopening will get it to pop up or just give it a few seconds it will will show up as well. I haven't noticed it happening in a whole lot of apps though.
As far as google smart lock I really only remember seeing that with Netflix and Bitwarden seems to play fine with my Netflix app.
Yeah that would be spectacular. My work phone is iOS and I don't think I've ever had it not work on that ๐ still greatly prefer my Pixel 7 Pro though.