[BUG]Caused by: com.alibaba.fastjson2.JSONException: expect ':', but 55, offset 2, character ", line 1, column 2, fastjson-version 2.0.64 {"message_id":5777,"message_type":"platform.status.logout","message_source":"pcg","push_time":"2026-08-28T09:47:24

### 问题描述
at com.alibaba.fastjson2.JSONReaderUTF16.readFieldNameHashCode(JSONReaderUTF16.java:1234)
at com.alibaba.fastjson2.reader.ORG_4_5_PlatformMqMessageVo.readObject(Unknown Source)
at com.alibaba.fastjson2.JSON.parseObject(JSON.java:1228)

arm环境下对json格式数据的兼容性

### 环境信息
*请填写以下信息：*

- OS信息： aarch64
- JDK信息：
java version "1.8.0_451"
Java(TM) SE Runtime Environment (build 1.8.0_451-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.451-b10, mixed mode)
- 版本信息： Fastjson2.0.64

### 重现步骤
1.0版本升级至 最新版本 出现解析错误

Start at JSONReaderUTF16.java:1234 and trace the failure from JSON.parseObject through the generated ORG_4_5_PlatformMqMessageVo reader. Reproduce the reported input on aarch64 with Fastjson 2.0.64 and compare it with the 1.0 version. Done means the reported JSON is parsed correctly without the expect ':' error, with regression coverage added if the repository provides an appropriate test location.

Written by the indexing model from the issue text.