New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest version of Parse Server.

Issue Description

obj.increment does not appear to be atomic.

Steps to reproduce

I have the following code in the beforeSave hook of "childClass" and child has a pointer "parent" to "parentClass".

await obj.get("parent").increment("number_children").save(null, {
    useMasterKey: true,
});

Actual Outcome

Creating two child objects simultaneously results in "number_children" increasing from 0 to 1.
This does not happen with:

await obj1.save();
await obj2.save();

but only with

await Promise.all(obj1.save(), obj2.save());

Expected Outcome

I expected the count to increase from 0 to 2.

Environment

Server

• Parse Server version: 6.2.2
• Operating system: MacOS Ventura
• Local or remote host (AWS, Azure, Google Cloud, Heroku, Digital Ocean, etc): local

Database

• System (MongoDB or Postgres): MongoDB
• Database version: 6.0.10
• Local or remote host (MongoDB Atlas, mLab, AWS, Azure, Google Cloud, etc): MongoDB Atlas

Client

• SDK (iOS, Android, JavaScript, PHP, Unity, etc): js
• SDK version: 4.2.0

Logs