Disconnect immediately after joining the channel

[datpt11]

I'm having a problem on .net framework 4.8.1, the backend reported a successful join

[Debug]: push - Pushing Phoenix.Message
[Debug]: transport - heartbeat timeout. Attempting to re-establish connection
Exception thrown: 'System.InvalidOperationException' in System.dll
Exception thrown: 'System.ObjectDisposedException' in System.dll
Exception thrown: 'System.ObjectDisposedException' in System.dll
Exception thrown: 'System.InvalidOperationException' in System.dll
Exception thrown: 'System.InvalidOperationException' in mscorlib.dll
Exception thrown: 'System.Net.WebSockets.WebSocketException' in System.dll
Exception thrown: 'System.Net.WebSockets.WebSocketException' in mscorlib.dll
Exception thrown: 'System.Net.WebSockets.WebSocketException' in System.dll
Exception thrown: 'System.InvalidOperationException' in System.dll
Exception thrown: 'System.InvalidOperationException' in System.dll
Exception thrown: 'System.AggregateException' in mscorlib.dll
[Debug]: transport - Error One or more errors occurred.
One or more errors occurred.
Exception thrown: 'System.Net.WebSockets.WebSocketException' in System.dll
[Debug]: channel - error after_join:20
Phoenix.Message
[Debug]: transport - Close 1000 heartbeat timeout
Exception thrown: 'System.Net.WebSockets.WebSocketException' in mscorlib.dll
Exception thrown: 'System.Net.WebSockets.WebSocketException' in System.dll
Exception thrown: 'System.Net.WebSockets.WebSocketException' in mscorlib.dll
Exception thrown: 'System.AggregateException' in mscorlib.dll
[Debug]: transport - Error One or more errors occurred.
One or more errors occurred.