MQTTnet: Multiple IDEs try to bind to the same socket

I have no idea what is supposed to be wrong here. From the ui.log, it looks like there were two instances of the IDE at one point as I thought there was a crash early on after Initialise(0.0) but there were two interleaved sets of initialisation calls, and the following logged MQTTnet error, but it carried on.

[14:52:48:640(a302)] MQTT - System.AggregateException: One or more errors occurred. (Only one usage of each socket address (protocol/network address/port) is normally permitted.) ---> System.Net.Sockets.SocketException (10048): Only one usage of each socket address (protocol/network address/port) is normally permitted. at System.Net.Sockets.Socket.UpdateStatusAfterSocketErrorAndThrowException(SocketError error, Boolean disconnectOnFailure, String callerName) at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.Sockets.Socket.Bind(EndPoint localEP) at MQTTnet.Implementations.CrossPlatformSocket.Bind(EndPoint localEndPoint) at MQTTnet.Implementations.MqttTcpServerListener.Start(Boolean treatErrorsAsWarning, CancellationToken cancellationToken) at MQTTnet.Implementations.MqttTcpServerAdapter.RegisterListeners(MqttServerTcpEndpointBaseOptions options, X509Certificate2 tlsCertificate, CancellationToken cancellationToken) at MQTTnet.Implementations.MqttTcpServerAdapter.StartAsync(IMqttServerOptions options) at MQTTnet.Server.MqttServer.StartAsync(IMqttServerOptions options) --- End of inner exception stack trace --- at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions) at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken) at System.Threading.Tasks.Task.Wait() at YoYoStudio.IDE.MqttInitialise()

What in particular was not working? You will have to give us more information than this if you want us to help.

YoYoGames / GameMaker-Bugs

MQTTnet: Multiple IDEs try to bind to the same socket #7057

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