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.
} else {
      let recyclableInstance = workInProgress.stateNode;
      let newInstance = cloneInstance(
        currentInstance,
        updatePayload,
        type,
        oldProps,
        newProps,
        workInProgress,
        childrenUnchanged,
        recyclableInstance,
      );
      if (
        finalizeInitialChildren(
          newInstance,
          type,
          newProps,
          rootContainerInstance,
          currentHostContext,
        )
      ) {
        markUpdate(workInProgress);
      }
      workInProgress.stateNode = newInstance;
      if (childrenUnchanged) {
        
        
        
        markUpdate(workInProgress);
      } else {