Can not get original ParseObject correctly in afterSave hook when update the ParseObject

[wangmengyan95]

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Environment Setup

Run parse-server master branch locally

Steps to reproduce

Step 1. Set a afterSave hook for a ParseObject like

Parse.Cloud.afterSave('Test', function(req) {
  console.log(req.original._toFullJSON());
});

Step 2. Create a ParseObject by REST API

curl -X POST -H "X-Parse-Application-Id: myAppId"   -H "Content-Type: application/json"   -d '{"key":"value", "ACL": {"*": {"write": true}}}'   http://localhost:1337/parse/classes/LQACL

Step 3. Update the ParseObject by REST API

curl -X PUT -H "X-Parse-Application-Id: myAppId"   -H "Content-Type: application/json"   -d '{"key":"value1"}'   http://localhost:1337/parse/classes/LQACL/XXXX

Logs/Trace

The log of the cloud code is

{ objectId: 'iBVBtKnluf', __type: 'Object', className: 'LQACL' }

You can see we miss ACL and key fields.

The reason is in rest.js, we do a query to find the original value of the ParseObject before update, however, if the current req do not have permission to get access to the ParseObject, we can not find the original ParseObject.