As someone has suggested, it is probably a part used in manufacturing process. The original part doesn't have it, and it seems to be cut off. And that is exactly what I did, and everything works. There is nowhere to attach it anyway so instead of folding it and trying to fit it in, you might as well just cut it off.
Lorsqu'il en aura reçu, il pourra afficher un graphique de sa réputation au fil du temps.
Voici un aperçu de ce à quoi ressemble ce graphique :
Aucun point de réputation obtenu pour l'instant.