Two accounts were previously added to LastPass (a.some.com, b.some.com).
Logging into a third tool (c.some.com) for the first time enters a page to change its initial password. There is a LastPass button inside the password field which (when clicked) pops up a red "Generate and Fill" button which I dutifully press. A masked password is generated. I click the "save" button on c.some.com which exits the password-change page and returns to a log in page... because... some web tools do that. At the c.some.com login page, a LastPass popup asks "Which account should we update" a.some.com or b.some.com? Neither is correct, there is no option to add an account (c.some.com) and no option to copy the previous password to clipboard. The password is irretrievable and the "forgot password" button must be pressed.
Please allow an account to be created from the "Which account should we update" popup.