But not with just a single reaction. Both noStrudel (screenshot above) and Amtehyst list the double-heart as single reaction by a single user.

nostr:npub1d0enakaludyvruzdndcgl4glkcqyfpvp9tdtf8cawzkskekhcu2sq9xlas how do you do this? And why do clients support it? Can you troll-react here with 12 hearts to see how clients like that?