Typescript 即使子网是公共的，AWS CDK EventBridge ECS任务也无法分配公共IP地址

我正在创建一个ECS任务，以便在由EventBridge事件触发时运行，但我无法为该任务分配公共IP地址，这是访问ECS获取任务所必需的.我正在使用的VPC只有公共VLAN.

这是相关代码:

const cluster = new ecs.Cluster(this, "default-cluster", {
  vpc,
  clusterName: `xxxxx`,
  enableFargateCapacityProviders: true,
});

const taskDefinition = new ecs.FargateTaskDefinition(
  this,
  `${process.type}-task`,
  {
    memoryLimitMiB: 512,
    cpu: 256,
    runtimePlatform: {
      cpuArchitecture: ecs.CpuArchitecture.X86_64,
      operatingSystemFamily: ecs.OperatingSystemFamily.LINUX,
    },
  }
);

taskDefinition
  .addContainer(`xxxxxxxx`, {
    image: ecs.ContainerImage.fromEcrRepository(repo, props.imageTag),
    containerName: `xxxxxx`,
  })
  .addPortMappings({
    containerPort: 3000,
  });

const releaseTask = new eventBridgeTargets.EcsTask({
  cluster,
  taskDefinition,
  taskCount: 1,
  launchType: ecs.LaunchType.FARGATE,
  subnetSelection: vpc.selectSubnets({
    subnetType: SubnetType.PUBLIC,
  }),
  assignPublicIp: true,
});

我收到的错误是: Error: assignPublicIp should be set to true only for PUBLIC subnets

我做错了什么？