Cloudflare's Pupeteer Browser Rendering

Cloudflare's Pupeteer Browser Rendering worker example does not show sticky navs for some reason--both for my website and others I've tried like Shadcn's site.

Any ideas how to make the sticky nav visible in the screenshot, like it is when visiting the website in a regular brower?

I've tried every setting I can think of, delays, etc. My code is based on the basic example: https://developers.cloudflare.com/browser-rendering/get-started/screenshots/
CF_pupeteer_screenshot.jpeg
expected.png
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