Hello @Louis-Marie 
Thank you for your feedback 
I have not been able to reproduce your issue.
By looking at your smart fields, I assume it is following this previous topic, right?
Can you confirm me you are using afterFind hook for creating your smart fields card and kyc?
As I can see, it seems to work well with the subscription field. Is it a smart field? How is it declared?
Would that be possible for you to share with us your models, routes if overidden, and smart field declaration?
It will help us getting as closer as possible of your configuration.
Furthermore, just to be sure and clarify a point when you are saying "kyc and card are not displayed in the summary view", you mean you can see the id with a link but not the value with a link?
Let me know 