This is a fairly minor bug, but the

seems to have a few things wrong with it.

First it shows up in inventory uncategorized (other hearts are in food or in special categories).
Second issue with it is that when you click it, you don't get an option to Turn In Currency as you do for other hearts.

I just earned 3 of these Too Cute candy heart and there is no option to turn in currency. The only option given is to feed to a pet :).

you can just go here https://subeta.net/ss.php/louis/turnin And give all of them directly to L'Amour~

... I know - but it's still an event bug 💙 And no way to just turn in this one without putting all the rest in the vault temporarily...

Tested this, and it is still without the Turn in Currency option like the other ones. Passing it along.