:suggestion reads from, by, note, mark, and #id; :comment reads by, note, and #id; and a reply reads reply, by, and note. Any other prop is ignored, so a guessed one shows nothing: reason="…" leaves the suggestion with no card.
Incorrect
To
To :suggestion[sign in]{from="log in" reason="The button says Sign in."}, enter your email.Correct
To log insign inThe button says Sign in., enter your email.
To :suggestion[sign in]{from="log in" note="The button says Sign in."}, enter your email.