qwen-plus api流输出的数据为什么前后都会带上双引号

在api调用的时候只要plus版本是流输出带有前后双引号,其他版本没有,在提示词中也做了限制,但是返回的结果中还是带了

2025-07-21 17:06:00.581 INFO 32036}{magenta} --- [liyuncs.com/...] c.y.a.c.u.AiChatUtils : 请求流获取到的数据event: {"finish_reason":"null","message":{"role":"assistant","content":"\""}}
2025-07-21 17:06:00.596 INFO 32036}{magenta} --- [liyuncs.com/...] c.y.a.c.u.AiChatUtils : 请求流获取到的数据event: {"finish_reason":"null","message":{"role":"assistant","content":"裁员"}}
2025-07-21 17:06:00.635 INFO 32036}{magenta} --- [liyuncs.com/...] c.y.a.c.u.AiChatUtils : 请求流获取到的数据event: {"finish_reason":"null","message":{"role":"assistant","content":"潮"}}
2025-07-21 17:06:00.662 INFO 32036}{magenta} --- [liyuncs.com/...] c.y.a.c.u.AiChatUtils : 请求流获取到的数据event: {"finish_reason":"null","message":{"role":"assistant","content":"下还能保持"}}
2025-07-21 17:06:00.727 INFO 32036}{magenta} --- [liyuncs.com/...] c.y.a.c.u.AiChatUtils : 请求流获取到的数据event: {"finish_reason":"null","message":{"role":"assistant","content":"豁达心态，"}}
2025-07-21 17:06:00.865 INFO 32036}{magenta} --- [liyuncs.com/...] c.y.a.c.u.AiChatUtils : 请求流获取到的数据event: {"finish_reason":"null","message":{"role":"assistant","content":"你这种处变"}}
2025-07-21 17:06:00.889 INFO 32036}{magenta} --- [liyuncs.com/...] c.y.a.c.u.AiChatUtils : 请求流获取到的数据event: {"finish_reason":"null","message":{"role":"assistant","content":"不惊的态度挺"}}
2025-07-21 17:06:00.987 INFO 32036}{magenta} --- [liyuncs.com/...] c.y.a.c.u.AiChatUtils : 请求流获取到的数据event: {"finish_reason":"null","message":{"role":"assistant","content":"让我佩服的，最近"}}
2025-07-21 17:06:01.149 INFO 32036}{magenta} --- [liyuncs.com/...] c.y.a.c.u.AiChatUtils : 请求流获取到的数据event: {"finish_reason":"null","message":{"role":"assistant","content":"是不是有什么新计划？\""}}
2025-07-21 17:06:01.181 INFO 32036}{magenta} --- [liyuncs.com/...] c.y.a.c.u.AiChatUtils : 请求流获取到的数据event: {"finish_reason":"stop","message":{"role":"assistant","content":""}}