When I am logged in to my vault on both, the DuckDuckGo and the Firefox desktop browsers and refresh the page vault.bitwarden.com it prompts me for my master password again. But although I have a corresponding entry, instead of offering that it offers to generate a new password.
I only see this behavior with the Firefox extension for Firefox desktop and the DuckDuckGo desktop browser integration, but not on Safari where it correctly offers the save password.