The website above is the exact one, and clicking on the icon in the tool bar works - yay!
If I open the 1password app and select the BMO entry, hover over the website, the click on "Open and Fill" popup - then it doesn't work.
I don't know what the #shadow-root issue is, but is it fixable from my end?
Did something change in the interface lately? I (thought I) used to be able to click to select an entry, hover over the selected name, and an autofill button would appear (vs. having to hover over the website line in the entry, which doesn't work in this case anyway)