Sandbox: https://codesandbox.io/s/cranky-kapitsa-op3jh

Repro: type "a" and then after a second "b"

Expected: Eventually you'll see "ab" in all fields. Pending "..." indicator goes away.

Actual: You'll keep seeing "a" in low pri field. Pending "..." indicator is stuck.
render() {
          return (
            <Suspense fallback={<Fallback />}>
              <AsyncText text="Hi" ms={100} />
            </Suspense>
          );
        }
      }
      ReactNoop.renderLegacySyncRoot(<Demo />);
      expect(Scheduler).toHaveYielded([
        'Suspend! [Hi]',
        'Loading...',
        
        'Suspend! [Hi]',
        'Loading...',
      ]);
      expect(ReactNoop.getChildren()).toEqual([span('Loading...')]);
      await advanceTimers(100);
      expect(Scheduler).toHaveYielded(['Promise resolved [Hi]']);
      expect(Scheduler).toFlushExpired(['Hi']);
      expect(ReactNoop.getChildren()).toEqual([span('Hi')]);
    });
    if (global.__PERSISTENT__) {
      it('hides/unhides suspended children before layout effects fire (persistent)', async () => {
        const {useRef, useLayoutEffect} = React;
        function Parent() {