[Bug]: NullReferenceException thrown when using invalid URL

### Duplicate ?

- [X]Duplicate of #1331

### Product version

1.5.1

### Describe expected behavior

I have a net.tcp WCF Service bound to the following URL:
net.tcp://localhost:1234/service/bootstrap2/0

If I call this service with a wcf client, but uses endpoint address:

net.tcp://localhost:1234/service/bootstrap2/1

I get a NullReferenceException logged in my log - instead of a more "correct" 404 not found.

The reason for client calling the "wrong" url - is because our client can also connect to a service running on netframework, where portsharing is enabled, so services on the same server share the port, but only differentiate on the last part of the url, i.e. one service binds to /0 the other binds to /1.

In net framework WCF, this never causes errors to be logged server side, and client just tries next number - with corewcf when a client tries a "wrong" url, the null reference exceptions is logged

### Describe actual behavior

Null reference exception thrown instead of a more correct exception that should be captured by the framework and turned into a communication exception

### Which binding

NetTcp

### security

None

### Which .NET version

.NET 6

### Which os platform

Windows

### Code snippet used to reproduce the issue

```c#
No real code example - but create a net.tcp service, bind to specific url - call service with a WCF client on correct port, but slightly different url.

I have verified the problem with the samples in:

https://github.com/CoreWCF/samples/tree/main/Scenarios/Getting-Started-with-CoreWCF

Start the net.tcp server - and use the NetCoreClient and change the url to end with /netTcp2
```

### Stacktrace if any

```shell
00:18:36.358|3788037464|ERROR|119|Kestrel|Unhandled exception while processing 0HN132C763JHH.|System.NullReferenceException
Object reference not set to an instance of an object.
at CoreWCF.Channels.Framing.FramingModeHandshakeMiddleware.OnConnectedCoreAsync(FramingConnection connection)
at CoreWCF.Channels.Framing.FramingModeHandshakeMiddleware.OnConnectedAsync(FramingConnection connection)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.KestrelConnection`1.ExecuteAsync()
```