CharacterMap doesn't start drags from the large character view

[waddlesplash]

1. Open CharacterMap.
2. Align some character you want to drag with the top of the list view, by scrolling.
3. Click+drag upward, so that your mouse goes directly from the large "pop-out" view of the character, to the menu and window border.
4. Nothing happens.

(If you drag sideways or down, across the list view, it works.)