Incompatible type of tool_choice

[DesZhang]

Which version of LM Studio?
LM Studio 0.3.15

Which operating system?
MacOS M3

What is the bug?
As mentioned in openai doc in https://platform.openai.com/docs/api-reference/chat/create, tool_choice could be 'object', but I got {"error":"Invalid tool_choice type: 'object'. Supported string values: none, auto, required"} when trying to pass object value.

Screenshots

To Reproduce
Steps to reproduce the behavior:

curl http://localhost:1234/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "qwen3-30b-a3b",
    "messages": [{"role": "user", "content": "John Doe is 30 years old."}],
    "tools": [
      {
        "type": "function",
        "function": {
          "name": "UserInfo",
          "description": "Correctly extracted `UserInfo` with all the required parameters with correct types",
          "parameters": {
            "type": "object",
            "properties": {
              "name": {
                "title": "Name",
                "type": "string"
              },
              "age": {
                "title": "Age",
                "type": "integer"
              }
            },
            "required": ["age", "name"],
            "additionalProperties": false
          }
        }
      }
    ],
    "tool_choice": { "type": "function", "function": { "name": "UserInfo" } }
  }'