Well spotted, thanks.
> … why is there only half a heart there? …
https://www.peppercarrot.com/gd/viewer/misc__2010-07-21_Alic...
C is coeur (French).
The adjacent Jack of Clubs has only part of the trèfle icon.
Comparable:
https://en.wikipedia.org/wiki/French-suited_playing_cards#/m...