agent.generate() with structuredOutput.model throws "promise 'text' was not resolved or rejected

Error: promise 'text' was not resolved or rejected when stream finished

import { Agent } from "@mastra/core/agent";
import { z } from "zod";

// Agent creation
const agent = new Agent({
  id: "my-agent",
  name: "my-agent",
  description: "Test agent",
  instructions: "You are a helpful assistant",
  model: "openai/gpt-4o",
  tools: {
    // ... tools if any
  },
  memory: undefined, // or memory instance
});

const outputSchema = z.object({
  response: z.string(),
  status: z.enum(["success", "error"]),
});

// Calling generate with structuredOutput.model
async function testGenerate() {
  try {
    const response = await agent.generate(
      [{ role: "user", content: "Hello" }],
      {
        structuredOutput: {
          schema: outputSchema,
          model: "openai/gpt-4o-mini",
        },
        resourceId: "test-resource",
        threadId: "test-thread",
        modelSettings: {
          temperature: 0.7,
        },
      }
    );
    
    console.log(response.object);
  } catch (error) {
    console.error(error);
    // Error: promise 'text' was not resolved or rejected when stream finished
  }
}