Laravel route model binding for model with uuid does not instantiate model

I’ve run out of ideas so I thought I’ll ask around – here’s my code:

# app/Map/MapServiceProvider.php

class MapServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any package services.
     */
    public function boot(): void
    {
        Route::model('map_marker', Marker::class);

        $this->loadMigrationsFrom(__DIR__.'/Migrations');
        $this->loadRoutesFrom(__DIR__.'/routes.php');
    }

    // ...
}

Provider added to the app.php

'providers' => ServiceProvider::defaultProviders()->merge([
    // ...
    AppMapMapServiceProvider::class,
])->toArray(),

# app/Map/routes.php

use AppMapControllersUpdateMarkerController;
use IlluminateSupportFacadesRoute;

Route::put('/marker/{map_marker}', UpdateMarkerController::class)
    ->whereUuid('map_marker');
// ...

# app/Map/Migrations/.._create_map_markers_table.php

Schema::create('map_markers', function (Blueprint $table) {
    $table->uuid('id')->primary();
    $table->double('lat');
    $table->double('lng');
    $table->timestamps();
});

# app/Map/Models/Marker.php

class Marker extends Model
{
    use HasUuids;

    protected $table = 'map_markers';

    protected $fillable = ['lat', 'lng'];
}

The model does not seem to resolve – I’m getting empty model when injected to the controller’s invoke method:

# app/Map/Controllers/UpdateMarkerController.php

class UpdateMarkerController extends Controller
{
    public function __invoke(Marker $marker): JsonResponse 
    {
        dd($marker);
    }
}

result:

AppMapModelsMarker {#285 // app/Map/Controllers/UpdateMarkerController.php:21
  #connection: null
  #table: "map_markers"
  #primaryKey: "id"
  #keyType: "int"
  +incrementing: true
  #with: []
  #withCount: []
  +preventsLazyLoading: false
  #perPage: 15
  +exists: false
  +wasRecentlyCreated: false
  #escapeWhenCastingToString: false
  #attributes: []
  #original: []
  #changes: []
  #casts: []
  #classCastCache: []
  #attributeCastCache: []
  #dateFormat: null
  #appends: []
  #dispatchesEvents: []
  #observables: []
  #relations: []
  #touches: []
  +timestamps: true
  +usesUniqueIds: true
  #hidden: []
  #visible: []
  #fillable: array:2 [
    0 => "lat"
    1 => "lng"
  ]
  #guarded: array:1 [
    0 => "*"
  ]
}

When I try to pull it directly from the router:

# app/Map/Controllers/UpdateMarkerController.php

class UpdateMarkerController extends Controller
{
    public function __invoke(IlluminateHttpRequest $request): JsonResponse 
    {
        dd($request->route('map_marker'));
    }
}

I get just the value of the bound segment:

"9a783cd6-3e87-49b8-b392-e1bb8be45521"

I’m sure I must be missing something simple, but spent hours already trying to figure this out so some help would be much appreciated.