having problems with dict used in get requests

Q&A (please complete the following information)

• OS: Windows 11
• Browser: Chrome
• Version: 134.0.6998.179
• Method of installation: pip with fastapi
• Swagger-UI version: 3.10.0
• Swagger/OpenAPI version: OAS 3.1

Describe the bug you're encountering

having problems with dicts used in get requests

To reproduce...

Steps to reproduce the behavior:
write pydantic + fastapi code

import json
from typing import Optional, List
from fastapi import FastAPI, APIRouter, Query, Request, Response
from fastapi.responses import JSONResponse
from pydantic import BaseModel, Field
from pydantic import ConfigDict, field_validator

app = FastAPI()

class AdBase(BaseModel):
    id: str
    title: str
    owner: Optional[str] = None
    doc_id: Optional[List[str]] = None

class AdGetRequest(AdBase):
    page: int = Field(0, gt=-1)
    filters: Optional[dict] = Field(
        default=None,
        example={"location": ["Ankara", "İstanbul"], "position_title": "Yazılım"}
    )
    owner: Optional[str] = Field(None)
    doc_id: Optional[List[str]] = Field(None)
    
    model_config = ConfigDict(extra="ignore")
    
    @field_validator("filters", mode="before")
    def parse_filters(cls, value):
        if value is None:
            return value
        if isinstance(value, str):
            try:
                return json.loads(value)
            except json.JSONDecodeError:
                raise ValueError("filters must be a valid JSON string representing a dictionary")
        return value

@app.get("/management")
async def get_ads(request: Request, ad: AdGetRequest = Query(...)):
    print(f"Received Filters: {ad.filters}")
    
    return JSONResponse(content={"message": "Filters received","filters": ad.filters})

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)

Expected behavior

url should be:
localhost:8002/DB/ad/management?page=0&filters={"location": ["Ankara", "İstanbul"], "position_title": "Yazılım"}

not:
localhost:8002/DB/ad/management?page=0&location=["Ankara","İstanbul"]&position_title=Yazılım

filters missing.

Screenshots

The request is wrong, it's not usable.

Start by reproducing the provided FastAPI and Pydantic example in Chrome with Swagger UI 3.10.0, then compare the generated GET query with the expected filters parameter. Done would require a confirmed Swagger UI reproduction using a minimal OpenAPI document and a specific affected entry point or test; the report identifies neither.