Editing pivot data of Relationship not working

I created a RelationshipManager and I can Attach to my relationship with a pivot field.
This works properly, and I can display the pivot data in the relationship table as you can see in the first 2 screenshots.

My issue is, if I click Edit next to the relationship, the "Role" field won't get filled.
Also, if I create a new Contact form outside the relationship manager, the pivot field is still displayed and shouldn't.
Both the relationship and inverse relationship have ->using("RolePivot::class")->withPivot("role")

Any idea what's going on ?
Can't find any example in the docs other than very simple ones in https://filamentphp.com/docs/4.x/resources/managing-relationships
Capture_decran_le_2025-12-08_a_12.14.17.png
Capture_decran_le_2025-12-08_a_12.14.36.png
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