Accordions not working after migration D8 to D9

Hi :)

Problem/Motivation

I upgrade my D8 to D9 with fieldgroups accordion 100% functionnal.
After upgrade, accordion are not showed (but no errors) as if there is no field group (but in my content type field groups and accordions style are still ok)

Steps to reproduce

Make a fieldgroup accordion on a D8
Upgrade to D9

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Thanks :)