Promise component error propagation

[Zolmeister]

Components which return promises do not error correctly.

e.g. https://codesandbox.io/s/black-fast-zw42m

function Counter() {
  return h("div", {}, Promise.reject("x"));
}
render(<Counter />, rootElement) // doesn't propagate error

[Sultan]

Looking at the console, the error propagates, it just doesn't propagate to the catch callback.