[BUG]Fastjson2Encoder

webFlux中 使用 2.0.57版本的
com.alibaba.fastjson2.support.spring6.http.codec.Fastjson2Encoder encoder = new com.alibaba.fastjson2.support.spring6.http.codec.Fastjson2Encoder(objectMapper, fastJsonConfig);
com.alibaba.fastjson2.support.spring6.http.codec.Fastjson2Decoder decoder = new com.alibaba.fastjson2.support.spring6.http.codec.Fastjson2Decoder(objectMapper, fastJsonConfig);
上传文件正常，更新到2.0.59版本使用最新的

上传文件会报错误

Start by reproducing the WebFlux file upload with Fastjson2Encoder and Fastjson2Decoder on versions 2.0.57 and 2.0.59, using the configurations shown in the issue. Compare the behavior and error shown in the attached screenshots; done means file uploads work on 2.0.59 without the reported error.

Written by the indexing model from the issue text.