include object in toJson not work

[mbfakourii]

New Issue Checklist

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

Issue Description

to json does not work correctly in full=true mode when we use includeObject and the value is List

Steps to reproduce

I used tojson(full = true) to convert ParseObject to json and the output does not contain fully data my object has includeObject data in arraye

Actual Outcome

The output should include the full include objects in the list

Expected Outcome

The output is without full data and only contains pointers

Parse Flutter SDK

• SDK version: 3.1.3
• Operating system version: 11

Server

• Parse Server version: 5.2.5

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