"readable is not async iterable" generating PDF with @cloudflare/puppeteer + Browser Rendering

const browser = await puppeteer.launch(env.MYBROWSER);
const page = await browser.newPage();
await page.setContent('<h1>HELLO CLOUDFLARE</h1>', {
waitUntil: 'networkidle0',
});

 await page.pdf({ displayHeaderFooter: true })

TypeError: readable is not async iterable
    at getReadableAsBuffer (file:///Users/emillienemann/Documents/Code/talktweak/ClientWork/Nory/nory-sales/noryautomations-hono/.wrangler/tmp/dev-Vj79kl/index.js:45046:31)
    at Page2.pdf (file:///Users/emillienemann/Documents/Code/talktweak/ClientWork/Nory/nory-sales/noryautomations-hono/.wrangler/tmp/dev-Vj79kl/index.js:49130:26)
    at async markdownToR2Pdf (file:///Users/emillienemann/Documents/Code/talktweak/ClientWork/Nory/nory-sales/noryautomations-hono/.wrangler/tmp/dev-Vj79kl/index.js:52861:18)
    at async Array.<anonymous> (file:///Users/emillienemann/Documents/Code/talktweak/ClientWork/Nory/nory-sales/noryautomations-hono/.wrangler/tmp/dev-Vj79kl/index.js:52886:18)
    at async drainBody (file:///Users/emillienemann/Documents/Code/talktweak/ClientWork/Nory/nory-sales/noryautomations-hono/.wrangler/tmp/dev-Vj79kl/index.js:53277:12) {
  stack: TypeError: readable is not async iterable
    at g…-hono/.wrangler/tmp/dev-Vj79kl/index.js:53277:12),
  message: readable is not async iterable
}