I would like to know what are you really expecting to see here? When navigating to a website that requires credentials (that are stored inside passbolt):
You want them to be auto-filled without interacting with the fields at all and that it automatically click on “Submit” ?
You want that once you clicked on the auto-fill from the browser extension it automatically click on “Submit” ?
We really would like to understand this issue, also you said:
Enter your username and password in the login form
Are you entering them manually or are you using the browser extension?
Thanks for clarifying, it could be interesting to see what the community think about this idea, therefore you can create a feature request and see what people think about this