Nested workflows are not supported anymore?

  // Main workflow - Can I branch to a workflow or only to steps?
  const mainWorkflow = createWorkflow({
    id: 'main-workflow',
    inputSchema,
    outputSchema,
  })
    .branch([
      [async ({ inputData }) => inputData.state === 'PROCESS_A',
  simpleStep],
      [async ({ inputData }) => inputData.state === 'PROCESS_B',
  nestedWorkflow], // :x: Type error: Workflow is not assignable to Step
    ])
    .commit();