fix issue with belongsToMany relationship type

Author: milewski

src/HasConditionalContainer.php

@@ -7,7 +7,6 @@
 use Laravel\Nova\Fields\FieldCollection;
 use Laravel\Nova\Http\Controllers\ActionController;
 use Laravel\Nova\Http\Controllers\AssociatableController;
-use Laravel\Nova\Http\Controllers\AttachableController;
 use Laravel\Nova\Http\Controllers\CreationFieldController;
 use Laravel\Nova\Http\Controllers\FieldController;
 use Laravel\Nova\Http\Controllers\MorphableController;
@@ -152,7 +151,7 @@ private function flattenDependencies(NovaRequest $request, array $fields)
                  * If instance of any associative type flatten out all the fields
                  */
                 if ($controller instanceof AssociatableController ||
-                    $controller instanceof AttachableController ||
+//                    $controller instanceof AttachableController ||
                     $controller instanceof MorphableController ||
                     $controller instanceof ResourceAttachController ||
                     $controller instanceof FieldController) {