When I press the key combination, instead of filling the username and password fields, the Assistant (I think that's what it's called) pops up and I have to search for the item, it does not find the match by itself. Now, it gets better: when I click the item, it auto-fills but instead of logging me in, the website opens another Window without logging me in! It happens in Safari in macOS and in Firefox on Windows. This happens when there is a URL match, and auto-fill for the same websites used to work just fine.
The browser extensions are updated. In fact, I can auto-fill the username and password fields using the extension button. It finds the matching item and auto-fills and logs me in properly.