Entity Framework core 2.1 Using AsNoTracking with multiple Async gives InvalidOperationException: The connection was not closed

I have run two Async methods using Entity Framework 2.1 - one for selecting the total count and another for retrieving page data - and I marked my entity AsNoTracking as following:

var dbContext = new SamuraiAppDataCoreContext();

var query = dbContext.Samurais.AsNoTracking();
var pageQuery = query.Skip(0).Take(10);

var totalCountTask = query.CountAsync();
var pageRecordsTask = pageQuery.ToListAsync();

await Task.WhenAll(totalCountTask, pageRecordsTask);

var results = new { TotalCount = totalCountTask.Result, Pages = pageRecordsTask.Result };

Then I got the following error

InvalidOperationException: The connection was not closed. The connection's current state is connecting. System.Data.ProviderBase.DbConnectionClosedConnecting.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource retry, DbConnectionOptions userOptions

Notes: the error goes away in following scenarios

1. Removing "AsNoTracking"

2. using await for each Async

   var totalCount = await query.CountAsync();
   var pageRecords = await pageQuery.ToListAsync();
   

And my question is:
why AsNoTracking is not working with multi-Async calls?