Remove setting the block_prefix

src/Collection/Form/CollectionTypeExtension.php

@@ -59,6 +59,16 @@ public function buildView(FormView $view, FormInterface $form, array $options):
         }
     }
 
+    public function finishView(FormView $view, FormInterface $form, array $options): void
+    {
+        if (!$form->has('addButton')) {
+            return;
+        }
+
+        $addButton = $form->get('addButton');
+        $form->add('addButton', $options['add_type'], $options['add_options']);
+    }
+
     public function configureOptions(OptionsResolver $resolver)
     {
         $attrNormalizer = function (Options $options, $value) {
@@ -80,7 +90,6 @@ public function configureOptions(OptionsResolver $resolver)
         ]);
 
         $addOptionsNormalizer = function (Options $options, $value) {
-            $value['block_name'] = 'add_button';
             $value['attr'] = \array_merge([
                 'data-action' => $options['attr']['data-controller'] . '#add',
             ], $value['attr'] ?? []);
@@ -89,7 +98,6 @@ public function configureOptions(OptionsResolver $resolver)
         };
 
         $deleteOptionsNormalizer = function (Options $options, $value) {
-            $value['block_name'] = 'delete_button';
             $value['attr'] = \array_merge([
                 'data-action' => $options['attr']['data-controller'] . '#delete',
             ], $value['attr'] ?? []);

src/Collection/Tests/app/Kernel.php

@@ -91,7 +91,7 @@ public function form(Request $request, Environment $twig, FormFactoryInterface $
         $team1->addPlayer($player1);
         $player2 = new Player();
         $player2->firstName = 'Player';
-        $player2->lastName = 'A1';
+        $player2->lastName = 'A2';
         $team1->addPlayer($player2);
         $team2 = new Team();
         $team2->name = 'Symfony Core Team';