Extracted from https://github.com/facebook/react/issues/12643.

We're currently diff a host node in the complete phase even if it has bailed out in the begin phase. By itself, this just means we're doing a little bit more work than necessary. But it also has some observable effects. In particular, https://github.com/facebook/react/issues/13424 (which by itself would be very rare and probably not worth fixing) is made worse because we end up committing update to inputs from another component.

I have a fix for this in https://github.com/facebook/react/pull/13423. Filing this for posterity.
if (yieldedValues !== null) {
            return 0;
          }
          if (unitsRemaining-- > 0) {
            return 999;
          }
          didStop = true;
          return 0;
        },
        
        
        
        didTimeout: false,
      });
      if (yieldedValues !== null) {
        const values = yieldedValues;
        yieldedValues = null;
        yield values;
      }
    }
  }
  const ReactNoop = {
    getChildren(rootID: string = DEFAULT_ROOT_ID) {