GetHubContext<THubType, TClients>().Clients.All return wrong TClientImpl

[7999]

signalR version: 2.2.2

exception thrown when call the method "IConnectionManager.GetHubContext<THubType, TClients>().Clients.All",

code as below:

var clients =DependencyResolver.Resolve<IConnectionManager>().GetHubContext<MonitorHub, IMonitorClient>().Clients.All;

Exception Messages:
RuntimeBinderException: Cannot implicitly convert type 'Microsoft.AspNet.SignalR.Hubs.TypedClientBuilder.IScanClientImpl' to 'Mobile.Contract.Bolus.IMonitorClient'. An explicit conversion exists (are you missing a cast?)
Type : Microsoft.CSharp.RuntimeBinder.RuntimeBinderException, Microsoft.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Message : Cannot implicitly convert type 'Microsoft.AspNet.SignalR.Hubs.TypedClientBuilder.IScanClientImpl' to 'Mobile.Contract.Bolus.IMonitorClient'. An explicit conversion exists (are you missing a cast?)
Source : Anonymously Hosted DynamicMethods Assembly

Steps to reproduce

this issue is sporadic, hard to reproduce