配置文件中content配置多条任务只有第一个生效

配置从mongodb 同时导入多张表到aliyun dataworks ，只有第一条配置生效，没有任何报错

我测试的配置大概长下面样子
```json
{
"job": {
"setting": {
"speed": {
"channel": 2
}
},
"content": [
{mongodb colletion1},
{mongodb colletion2},
{mongodb colletion3}
]
}
}
```
感觉应该是软件bug

No source file or test is identified in the report. Reproduce the MongoDB-to-DataWorks import with three content entries, trace how the job configuration is parsed and scheduled, and verify that every configured collection is executed rather than only the first, without errors.

Written by the indexing model from the issue text.