Tamagotchi P's linking different pierces?

Okay so yesterday I finally got 2 new deco pierces for my tamagotchi, an Aikatsu one and a Coffret ver. one, which I'm really happy about. I linked both pierces just fine when my tamagotchi was a teen, but when I grew her up into Ichigochantchi and now my pierces won't link. I tried the original melody land pierce that came with the unit and the coffret one. I just wanted to ask if this is completely normal and if its because Ichigochantchi is a growth character (i.e. you get her from eating the nori bento 3 times with any female teen) as opposed to a dress-up character.

When you have a character obtained from a pierce, another pierce cannot be attached besides the pierce which had the character on it

Ah I thought so but I just wanted to confirm that this was the case. Thanks!