智能体添加变量依然不生效

大佬 之前提过一个 智能体变量不生效的问题 #2236 ，然后您这边说是解决了我们测试了之后好像还是不生效，代码已经拉取最新的了，然后镜像用的是latest。
使用这种方式：{
"bot_id": "7540201057557676032",
"stream": true,
"user_id": "11",
"additional_messages": [
{
"role": "user",
"content_type": "text",
"content": "{\"variables\": {\"roleType\": \"宝爸\", \"babyGender\": \"女\", \"sceneTag\": \"即将吃完\", \"babyStage\": \"3段\", \"brandTag\": \"至初\"}, \"prompt\": \"根据提示词和变量生成人设\"}"
}
]
} 可以生成，生成结果如下：

但是这种方式：
{
"bot_id": "7540201057557676032",
"stream": true,
"user_id": "11",
"additional_messages": [
{
"role": "user",
"content_type": "text",
"content": "帮我生成一下人设"
}
],
"custom_variables": {
"roleType": "宝爸",
"babyGender": "女",
"sceneTag":"即将吃完",
"babyStage":"3段",
"brandTag":"至初"

}
}
就没法生成，流式响应结果是：

Compare the reproduced request using custom_variables with the working additional_messages request, focusing on how each produces the streaming response. Done means the custom_variables form generates the expected agent persona instead of the shown failure response.

Written by the indexing model from the issue text.