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Blazor serverside SignalR issue after upgrading to 3.0.100-rc1-014190

See original GitHub issue

Upgrading dotnet sdk to 3.0.100-rc1-014190 causes an issue with SignalR:

How to reproduce:

Install new sdk 3.0.100-rc1-014190 binaries on Ubuntu
Create a new blazor serverside project: dotnet new blazorserver -au individual
Start the app: dotnet run
Navigate to https://localhost:5001/ and check the browser’s console, you will see:

[2019-09-17T14:19:04.940Z] Information: Normalizing '_blazor' to 'https://codescu.com/_blazor'. blazor.server.js:1:5212
Firefox nu poate stabili o conexiune cu serverul wss://codescu.com/_blazor?id=hm6jAVLCWc4yC4eZqxWerQ. blazor.server.js:1:37545
[2019-09-17T14:19:05.587Z] Error: Failed to start the transport 'WebSockets': Error: There was an error with the transport. blazor.server.js:1:5015
[2019-09-17T14:19:05.597Z] Warning: Call to HttpConnection.stopConnection(Error: WebSocket closed with status code: 1006 ().) was ignored because the connection hasn't yet left the in the connecting state. blazor.server.js:1:5112
[2019-09-17T14:19:05.738Z] Error: Failed to start the transport 'LongPolling': TypeError: this.transport is undefined blazor.server.js:1:5015
[2019-09-17T14:19:05.741Z] Error: Failed to start the connection: Error: Unable to connect to the server with any of the available transports. WebSockets failed: Error: There was an error with the transport. ServerSentEvents failed: Error: 'ServerSentEvents' does not support Binary. LongPolling failed: TypeError: this.transport is undefined blazor.server.js:1:5015
[2019-09-17T14:19:05.751Z] Error: Error: Unable to connect to the server with any of the available transports. WebSockets failed: Error: There was an error with the transport. ServerSentEvents failed: Error: 'ServerSentEvents' does not support Binary. LongPolling failed: TypeError: this.transport is undefined blazor.server.js:15:27313
Error: Cannot send data if the connection is not in the 'Connected' State. blazor.server.js:1:42087