uni-app 为什么我的uni-ai开启流stream报SYSTEM_ERROR，Unable to get object content

uni-app 为什么我的uni-ai开启流stream报SYSTEM_ERROR，Unable to get object content

操作步骤：

见描述

预期结果：

返回{errCode: 0}

实际结果：

{"errCode": "SYSTEM_ERROR","errMsg": "Unable to get object content"}

bug描述：

代码中的参数options和seeChannel见机密信息。

const llmManager = uniCloud.ai.getLLMManager(options)  
let streamRes = await llmManager.chatCompletion({  
    messages: [{"role":"user","content":"你好"}],  
    stream: true,  
    sseChannel: seeChannel  
})  
console.log(streamRes)  
return {  
    errCode: 0,  
    errMsg: ''  
}

之前该代码中streamRes会打印{errCode: 0}

但是不知道什么时候开始，返回的是

{
    "_events": Object,
    "_eventsCount": 0,
    "_maxListeners": undefined,
    ...
}

打开后显示

{"errCode": "SYSTEM_ERROR","errMsg": "Unable to get object content"}

使用的是nginx代理，且代理配置好了proxy_buffering off;

其中还会报错

03:58:44.955 [本地调试] SyntaxError: Unexpected token a in JSON at position 0  
03:58:44.957 [本地调试]     at JSON.parse (<anonymous>)  
03:58:44.957 [本地调试]     at IncomingMessage.emit (node:events:517:28)  
03:58:44.957 [本地调试]     at addChunk (node:internal/streams/readable:368:12)  
03:58:44.957 [本地调试]     at readableAddChunk (node:internal/streams/readable:341:9)  
03:58:44.957 [本地调试]     at Readable.push (node:internal/streams/readable:278:10)  
03:58:44.957 [本地调试]     at HTTPParser.parserOnBody (node:_http_common:131:24)  

14:06:20.422 [本地调试] Error [ERR_UNHANDLED_ERROR]: Unhandled error. (SyntaxError: Unexpected token a in JSON at position 0  
14:06:20.422 [本地调试]     at JSON.parse (<anonymous>)  
14:06:20.422 [本地调试]     at IncomingMessage.emit (node:events:517:28)  
14:06:20.422 [本地调试]     at addChunk (node:internal/streams/readable:368:12)  
14:06:20.422 [本地调试]     at readableAddChunk (node:internal/streams/readable:341:9)  
14:06:20.422 [本地调试]     at Readable.push (node:internal/streams/readable:278:10)  
14:06:20.422 [本地调试]     at HTTPParser.parserOnBody (node:_http_common:131:24))

使用uni-ai计费网关，不管是否开启stream，都是正常的。 使用openai，关闭stream是正常的，开启的话就会报这两个错误。 apiKey和proxy都是正常。 runtime中，Nodejs8，Nodejs12，Nodejs18都试过了。 之前是好的，运行正常的。不知道怎么回事。