fix issue #2998 throws fastjson2.JSONException

[Cooper-Zhong]

What this PR does / why we need it?

fix issue alibaba#2998 fastjson-compatible parseObject throws fastjson2.JSONException

Summary of your change

Please indicate you've done the following:

• [ ] Made sure tests are passing and test coverage is added if needed.
• [ ] Made sure commit message follow the rule of Conventional Commits specification.
• [ ] Considered the docs impact and opened a new docs issue or PR with docs changes if needed.