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.
useEffect(() => {
            Scheduler.unstable_yieldValue(
              `Committed state when effect was fired: ${getCommittedText()}`,
            );
          });
          return <Text text={props.count} />;
        }
        act(() => {
          ReactNoop.render(<Counter count={0} />, () =>
            Scheduler.unstable_yieldValue('Sync effect'),
          );
          expect(Scheduler).toFlushAndYieldThrough([0, 'Sync effect']);
          expect(ReactNoop.getChildren()).toEqual([span(0)]);
          
          ReactNoop.render(<Counter count={1} />, () =>
            Scheduler.unstable_yieldValue('Sync effect'),
          );
          expect(Scheduler).toFlushAndYieldThrough([
            
            'Committed state when effect was fired: 0',
            1,
            'Sync effect',
          ]);
          expect(ReactNoop.getChildren()).toEqual([span(1)]);
        });
        expect(Scheduler).toHaveYielded([
          'Committed state when effect was fired: 1',
        ]);
      },