Getting System.InvalidOperationException in nested method evan after calling the BeginTransaction

I have a method like below code. I pass a SqlConnection and a Transaction to the nested methods.

public async Task<IdentityResult> M(Model model, CancellationToken cancellationToken,
        SqlTransaction transaction = null)
{
     IdentityResult result;
     using (transaction = _sqlConnection.BeginTransaction())
     {
         try
         {
            result = await M1(_sqlConnection,model, cancellationToken, transaction);
            if (result.Succeeded) 
            {
                 result = await M2(_sqlConnection,model,cancellationToken, transaction);
            }
            transaction.Commit();
         }
         catch (Exception ex)
         {
             transaction.Rollback();
             result = GeneralErrors.Failed;
         }
   }
   return result;
}

When compiler comes to here:

 internal async Task<IdentityResult> M1(SqlConnection connection,Model model,CancellationToken cancellationToken,  SqlTransaction transaction = null)
 {
     using (var multi = connection.QueryMultiple(query.Query,transaction)) // Error
     {
          //...
     }
  }

I get this error when I call QueryMultiple method of Dapper.net:

System.InvalidOperationException: 'ExecuteReader requires the command to have a transaction when the connection assigned to the command is in a pending local transaction. The Transaction property of the command has not been initialized.'

How can I find out where is the problem?