I just tested this with your project, I ran npm update (confirm this with npm outdated), deleted the package-lock and node_modules and ran npm i and it now works fine for me. Make sure your @nuxt/ufo version is 0.5.4 in the package-lock .
Weird, the version is 0.5.4 but it's still not working. But it seems that you've solved the problem, so it's probably something locally.
Edit: I deleted the package-lock again and did a npm install 2 weeks later. The preview works now.
Keep me updated on how it goes and I can also test again on a fresh pull from your github if your really not getting anywhere.
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