Fix

Author: mcg-web

src/DependencyInjection/Compiler/IdentifyCallbackServiceIdsPass.php

@@ -52,6 +52,9 @@ private function resolveServiceIdAndMethod(ContainerBuilder $container, ?array &
             return;
         }
         [$id, $method] = explode('::', $callback['function'], 2) + [null, null];
+        if (str_starts_with($id, '\\')) {
+            $id = ltrim($id, '\\');
+        }
 
         try {
             $definition = $container->getDefinition($id);

tests/Functional/App/config/connection/mapping/connection.types.yaml

@@ -25,7 +25,7 @@ User:
             friendsBackward:
                 type: userConnection
                 argsBuilder: "Relay::BackwardConnection"
-                resolver: 'overblog_graphql.test.resolver.node::friendsResolver'
+                resolver: '\Overblog\GraphQLBundle\Tests\Functional\App\Resolver\ConnectionResolver::friendsResolver'
 
 friendConnection:
     type: relay-connection