Typescript client can't work with query params

[hascommitissues]

According to the https://docs.servicestack.net/api-design, I create my model like this:

[Route("/my-request")]
public class MyRequest : IGet, IHasQueryParams, IReturn<MyResponse>
{
  public Dictionary<string, string>? QueryParams {get; set;}
}

Now I generate a Typescript DTO:

// @Route("/my-request")
export class MyRequest implements IReturn<MyResponse>, IGet
{
    public queryParams?: { [index:string]: string; };

    public constructor(init?: Partial<MyRequest>) { (Object as any).assign(this, init); }
    public getTypeName() { return 'MyRequest'; }
    public getMethod() { return 'GET'; }
    public createResponse() { return new Array<MyResponse>(); }
}

Now, in my code, I send data like this:

    async getData(
        param1: string,
        param2: string,
        param3: string
    ): Promise<MyResponse> {
        return await this.client.get(
            new MyRequest({
                queryParams: { param1, param2, param3 },
            })
        );
    }

It generates the request like this:

https://localhost:5003/api/MyRequest?queryParams=%5Bobject%20Object%5D

Expected:

https://localhost:5003/api/MyRequest?param1=...&param2=...&param3=...