MySQL insert C# fails when Connection Pooling is activated

I have the following INSERT method in a C# web project. If I run the project without MySQL connection poling everything works fine, but when I activate Pooling=True in the DB connection string this method stops working, the insert statements never complete.

I realized how to modify the code to make it work, but I would like to understand what is happening and I hope you could help.

When I comment line //myR.Close(); everything works fine.

using MySql.Data.MySqlClient;
//query example consulta="INSERT INTO users (id, name) VALUES (1, 'Rob');

public static MySqlConnection GetWriteConnection()
    {
        string connStr = MySqlConnectionStrings.WriteConnectionString;
        MySqlConnection conn = new MySqlConnection(connStr);
        return conn;
    }

public static MySqlConnection GetReadConnection()
    {
        string connStr = MySqlConnectionStrings.ReadConnectionString;
        MySqlConnection conn = new MySqlConnection(connStr);
        return conn;
    }

public static bool Insert(string consulta)
    {
        MySqlConnection conn = BdaHelper.GetWriteConnection();
        conn.Open();

        using (conn)
        {
            try
            {
                if (conn.State == ConnectionState.Closed)
                {
                    conn.Open();
                }

                MySqlCommand micomando = new MySqlCommand(consulta, conn);
                micomando.ExecuteNonQuery(); //still not working

                return true;
            }
            catch (Exception ex)
            {
                return false;
            }
        }

    }

My app has also multi-thread concurrency and two types of database connections, one specifically for only-read purposes and other different for write. When an insert statement fails I don't get any error simply the change doesn't commit in the database. Reading the article in the comments I don't think this applies to this issue but I would add an example of my main program:

MySqlConnection readConnection = BdaHelper.GetReadConnection();

    using (readConnection)
    {
        var users = GetUsers(readConnection);
        var credentials = GetCredentials(readConnection);

        //Example is the query that fails don't giving any exception
        Insert("INSERT INTO login_log (id_user, date) VALUES (1, now())");
    }

• May the problem be caused because there are two concurrent connections?
• I shouldn't reuse read connection, even is a different connection than the write connection?