Filter a collection

Hello,

I have this collection.

Illuminate\Database\Eloquent\Collection {#1749 ▼ // app/Services/SaleService.php:24
  #items: array:1 [▼
    0 => 
App\Models
\
Commission {#1752 ▼
      #connection: "mariadb"
      #table: "commissions"
      #primaryKey: "id"
      #keyType: "int"
      +incrementing: true
      #with: []
      #withCount: []
      +preventsLazyLoading: false
      #perPage: 15
      +exists: true
      +wasRecentlyCreated: false
      #escapeWhenCastingToString: false
      #attributes: array:13 [▼
        "id" => 1
        "slug" => "01JG43DNA3EGY9Q583ZX7PSS1C"
        "from" => "2024-12-27"
        "to" => "2024-12-27"
        "role" => "seller"
        "calculation_base" => "1100.00"
        "amount" => "215.00"
        "sale_id" => 1
        "user_id" => 7
        "company_id" => 1
        "created_at" => "2024-12-27 13:03:18"
        "updated_at" => "2024-12-27 13:30:27"
      ]
      #original: array:13 [▶]
      #changes: []
      #casts: array:4 [▶]
      #classCastCache: []
      #attributeCastCache: []
      #dateFormat: null
      #appends: []
      #dispatchesEvents: []
      #observables: []
      #relations: []
      #touches: []
      +timestamps: true
      +usesUniqueIds: false
      #hidden: []
      #visible: []
      #fillable: array:9 [▶]
      #guarded: array:1 [▶]
    }
  ]
  #escapeWhenCastingToString: false
}

And I want to filter it according to the role.

dd($sales[0]->commissions->where('role', 'seller'));

After filtering, the array is empty. I have also tried with the filter function $sales[0]->commissions->filter(...) but the result is also an empty array.

Why ?

What am I doing wrong ?

Thanks for your help.

V