Empty model in attach{Model} and detach{Model} given #5

I'm currently facing the issue where I want to fix the following:

A User has multiple roles in the Resource as following:
AttachMany::make('Roles', 'roles', Role::class)->required()->rules('required'),

These Roles are Spatie/laravel-permissions roles.

On a User Edit form in Nova I want to check which roles a User can add with the following code:

`public function attachRole(User $user, User $model, Role $role): bool
{
if ($model->hasRole('admin')) {
return false;
}

    if (!$user->hasRole('admin') && $role->name === 'admin') {
        return false;
    }

    if (!$user->hasRole('admin') && $user->id === $model->id) {
        return false;
    }

    if ($user->hasRole('content manager') || $user->hasRole('event manager')) {
        return true;
    }

    return false;
}`

But $model is always an empty User model. i.e.
$user->id === $model->id

Equals 6 === null.

Do you use a new model, or an existing model in a edit form of a resource?