Errored stays up after the only reader that threw is disposed (isPending-opened branch) #4373

const [s, setS] = createSignal(3);
const act = action(function* (v: number) {
  setS(v);
  yield new Promise<void>(r => (release = r));
});

render(() => {
  const m = createMemo(() => {
    if (s() === 1) throw new Error("boom");
    return s();
  });
  return (
    <Errored fallback={e => "[ERR]"}>
      <Show when={isPending(m)}>
        <span>{m()}</span>
      </Show>
    </Errored>
  );
}, el);

act(1);   // the screen shows <span></span> while the action is in flight
release(); // after the action settles, the screen shows [ERR]