How are unhandled promise rejections reported

I know that I can add an event listener to catch

'unhandledrejection'

'unhandledrejection'

but I was wondering if these unhandled promise rejections are supposed to show up in the log/logpush? I do not see anything.

A simple test case is

export default {
  async fetch(request) {
    Promise.reject('Where can I see this?');
    return new Response('OK');
  }
};

export default {
  async fetch(request) {
    Promise.reject('Where can I see this?');
    return new Response('OK');
  }
};