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.
ReactNoop.flushPassiveEffects();
        expect(Scheduler).toHaveYielded(['Mount A [0]', 'Mount B [0]']);
      });
      if (
        deferPassiveEffectCleanupDuringUnmount &&
        runAllPassiveEffectDestroysBeforeCreates
      ) {
        act(() => {
          
          ReactNoop.render(<Counter count={1} />, () =>
            Scheduler.unstable_yieldValue('Sync effect'),
          );
          expect(Scheduler).toFlushAndYieldThrough(['Count: 1', 'Sync effect']);
          expect(ReactNoop.getChildren()).toEqual([span('Count: 1')]);
          expect(() => ReactNoop.flushPassiveEffects()).toThrow('Oops');
          
          
          
          
          expect(Scheduler).toHaveYielded([
            'Oops!',
            'Unmount B [0]',
            'Mount A [1]',
            'Mount B [1]',
          ]);
        });
        
        
        
        expect(Scheduler).toHaveYielded(['Oops!', 'Unmount B [1]']);