Thanks for the response @andrew735. I added the custom field/value pair based on the input `name` I found (I've done that for my own entries over the years with success) and that does help. Thankfully when using the legacy fill with or without the custom field/value LastPass extension does offer the icon to interact with in the input field to choose the site's password entry. I notice that the new improved save and fill does not offer that input icon in this specific scenario, but if that input icon were as reliably present as the legacy fill icon (even without the new dropdown card below the input) then the new fill feature would be an absolute win! However I imagine there's not much shared between the two fill features, I've built software in similar situations where something seems similar but share 0 lines of code 😂
Thanks Andrew!