SignalR Hub Method 'ConsumeCandidate' Not Invoked Despite Receiving Invocation

I have a SignalR hub with multiple endpoints, but only the ConsumeCandidate method fails to execute. The hub receives the invocation message (as seen in the logs) yet does not call the method, while other endpoints like StartGame work correctly.

Below is my Logging configuration from application.json:

JSONCopied
//I set additional parameters to Logging configuration in application.json
{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning",
      "Microsoft.AspNetCore.SignalR": "Debug",//this
      "Microsoft.AspNetCore.Http.Connections": "Debug"//and this one
    }
  }
}

Log output when the client calls the ConsumeCandidate endpoint:

BASHCopied
dbug: Microsoft.AspNetCore.SignalR.Internal.DefaultHubDispatcher[1] Received hub invocation: InvocationMessage { InvocationId: "2", Target: "ConsumeCandidate", Arguments: [ lolkek, 581dc267-d2ff-403f-924c-cd6dba40535b ], StreamIds: [ ] }.

The server receives the message but fails to invoke the necessary method. Here’s the relevant part of the LobbyHub:

CSHARPCopied
public class LobbyHub(ILobbyService lobbyService, ILogger<LobbyHub> logger, IGameService gameService,
    IElectionManager electionManager) : Hub
{
    // this method should be invoked
    public void ConsumeCandidate(string lobbyName, string userClientId)
    {
        logger.LogInformation($"Chancellor candidate received from: {userClientId}");
    }

    //For instance hub is able to invoke this one
    public async Task StartGame(string lobbyName, string userClientId)
    {
        await gameService.StartRound(lobbyName, userClientId);
    }
}

app.MapHub<LobbyHub>("/lobbyhub");

Note that there are no naming issues; all other hub methods work fine, the connection remains active, and clients can call other endpoints after ConsumeCandidate. I also tried adding the [HubMethodName("ConsumeCandidate")] attribute and enabled detailed errors:

CSHARPCopied
builder.Services.AddSignalR().AddHubOptions<LobbyHub>(options =>
{
    options.EnableDetailedErrors = true;
});

Client code invoking the method:

JAVASCRIPTCopied
const invokeMethod = async (methodName, ...args) => {
    console.log("Invoking method:", methodName, "\nwith args:", args);
    console.log("Connection state:", connection.state);
    return connection.invoke(methodName, ...args);
};

function setChoosingCandidatesButton(candidates) {
    candidates.allCandidates.forEach((candidate) => {
        const candidateButton = document.getElementById('s' + candidate.index);
        candidateButton.textContent = "choose";
        candidateButton.dataset.id = candidate.userId + " " + candidates.lobbyName;
        candidateButton.onclick = (e) => {
            let data = e.target.dataset.id.split(" ");
            invokeMethod("ConsumeCandidate", data[1], data[0]);
        };
    });
}

I tested this method using a second hub (GameHub), where ConsumeCandidate is defined as follows:

CSHARPCopied
public class GameHub(ILogger<GameHub> logger, IElectionManager electionManager) : Hub
{
    public async Task ConsumeCandidate(string lobbyName, string userClientId)
    {
        logger.LogInformation($"Chancellor candidate received from: {userClientId}");
    }
}

Logs for GameHub:

BASHCopied
dbug: Microsoft.AspNetCore.SignalR.Internal.DefaultHubDispatcher[1]
      Received hub invocation: InvocationMessage { InvocationId: "0", Target: "ConsumeCandidate", Arguments: [ lolkek, 581dc267-d2ff-403f-924c-cd6dba40535b ], StreamIds: [  ] }.
info: SecretHitler.WebApp.Hubs.GameHub[0]
      Chancellor candidate received from: 581dc267-d2ff-403f-924c-cd6dba40535b

Additionally, I overrode OnDisconnectedAsync in LobbyHub:

CSHARPCopied
//This method from LobbyHub
public override Task OnDisconnectedAsync(Exception? exception)
{
    logger.LogInformation($"Client disconnected {Context.ConnectionId}");
    return base.OnDisconnectedAsync(exception);
}

There are no exceptions or additional logs from OnDisconnectedAsync. I have verified that the hub is mapped correctly and SignalR is correctly registered in DI. The issue only occurs with the ConsumeCandidate method in LobbyHub. What could be causing the hub to not process the invocation for ConsumeCandidate?