Query State is not working with cockroachDB and .net Dapr Client

Expected Behavior

Query should retrieve the stored record.

Actual Behavior

Query doe not return any records.

Steps to Reproduce the Problem

Store the state as below

string id = "2";  // Guid.NewGuid().ToString();
string key = $"Api-{tenant}-{id}";
var api = new a { 
    b = "c"
};
await _daprClient.SaveStateAsync<a>(StoreName, key, api);
await _daprClient.SaveStateAsync<string>(StoreName, "2b", JsonSerializer.Serialize(api));

Retrieving state works fine: var x = (await _daprClient.GetStateAsync<a>(StoreName, "Api--2"));

However, query state always return no record:

var q = "{" +
    "\"filter\": {" +
        "\"EQ\": { \"value.b\": \"c\" }" +
    "}" +
"}";
//var q = "{" +
//    "\"filter\": {" +
//        "\"EQ\": { \"b\": \"c\" }" +
//    "}" +
//"}";

var queryResponse = await _daprClient.QueryStateAsync<a>(StoreName, q);
foreach (var entry in queryResponse.Results)
{
    Console.WriteLine($"value: {entry.Data.b}");
}

The data stored in database is binary:

            key           |                     value                      | isbinary | etag |          insertdate           |          updatedate
--------------------------+------------------------------------------------+----------+------+-------------------------------+--------------------------------
  api-manager-api||2b     | "IntcdTAwMjJiXHUwMDIyOlx1MDAyMmNcdTAwMjJ9Ig==" |   true   |    2 | 2022-09-13 18:58:40.340341+00 | 2022-09-13 19:01:44.954366+00
  api-manager-api||Api--1 | "eyJiIjoiYyJ9"                                 |   true   |    1 | 2022-09-13 18:23:42.650024+00 | NULL
  api-manager-api||Api--2 | "eyJiIjoiYyJ9"                                 |   true   |    2 | 2022-09-13 18:58:40.265943+00 | 2022-09-13 19:01:43.017007+00`
(3 rows)

Even after I managed to store the json into cockroachDB but the query with EQ: {"b", "c" } or EQ: {"value.b", "c"} still returns nothing.

            key            |                     value                      | isbinary | etag |          insertdate           |          updatedate
---------------------------+------------------------------------------------+----------+------+-------------------------------+--------------------------------
  api-manager-api||123     | "eyJiIjoiYyJ9"                                 |   true   |    2 | 2022-09-13 21:31:30.087913+00 | 2022-09-13 21:48:09.140251+00
  api-manager-api||2b      | "IntcdTAwMjJiXHUwMDIyOlx1MDAyMmNcdTAwMjJ9Ig==" |   true   |    2 | 2022-09-13 18:58:40.340341+00 | 2022-09-13 21:48:09.114109+00
  api-manager-api||444     | "IntcdTAwMjJiXHUwMDIyOlx1MDAyMmNcdTAwMjJ9Ig==" |   true   |    2 | 2022-09-13 21:37:57.557071+00 | 2022-09-13 21:48:09.150479+00
  api-manager-api||Api--1  | "eyJiIjoiYyJ9"                                 |   true   |    1 | 2022-09-13 18:23:42.650024+00 | NULL
  api-manager-api||Api--2  | "eyJiIjoiYyJ9"                                 |   true   |    2 | 2022-09-13 18:58:40.265943+00 | 2022-09-13 21:48:09.072631+00
  api-manager-api||order_3 | "eyJiIjoiYyJ9"                                 |   true   |    2 | 2022-09-13 21:01:16.154948+00 | 2022-09-13 21:19:28.855963+00
  api-manager-api||test1   | "{\\"b\\":\\"c\\"}"                            |  false   |    1 | 2022-09-13 21:48:09.160417+00 | NULL
(7 rows)