Switch-case workflow always falls back to default due to TurnToken interference, is this expected behavior?

[MrAssel]

Hi,
I'm building a switch-case workflow using agents, where the workflow itself runs as an agent within an orchestrating handoff agent workspace.

The issue I’m seeing is that during execution, the switch-case always returns to the default case. Based on logs, this seems to happen because a TurnToken is being passed into the switch evaluation, which causes all case conditions to fail.

Is this the intended behavior? If not, how should I handle or bypass the TurnToken so that the switch evaluates correctly?

Code:

WorkflowBuilder builder = new(queryAnalysisAgent);
builder
            .AddSwitch(queryAnalysisAgent, switchBuilder =>
                switchBuilder
                    .AddCase(
                        GetScopeCondition("narrow"),
                        narrowSearchAgent
                    )
                    .AddCase(
                        GetScopeCondition("broad"),
                        broadSearchAgent
                    )
                    .AddCase(
                        GetScopeCondition("combined"),
                        combinedSearchAgent
                    )
                    .WithDefault(narrowSearchAgent)
            )
            .AddEdge(source: narrowSearchAgent, target: synthesisAgent)
            .AddEdge(source: broadSearchAgent, target: synthesisAgent)
            .AddEdge(source: combinedSearchAgent, target: synthesisAgent)
            .WithOutputFrom(synthesisAgent);
var workflow = builder.Build();
var searchWorkflowAgent = await workflow.AsAgentAsync(name: "search_workflow");

Logs:
[14:09:13 INF] Successfully extracted scope_type: broad
[14:09:13 INF] Switch condition check: Expected=narrow, Extracted=broad, Match=False
[14:09:14 INF] Successfully extracted scope_type: broad
[14:09:14 INF] Switch condition check: Expected=broad, Extracted=broad, Match=True
[14:09:16 INF] Microsoft.Agents.AI.Workflows.TurnToken
[14:09:16 INF] Received TurnToken in condition evaluation, ignoring
[14:09:16 INF] Switch condition check: Expected=narrow, Extracted=ignore, Match=False
[14:09:17 INF] Microsoft.Agents.AI.Workflows.TurnToken
[14:09:17 INF] Received TurnToken in condition evaluation, ignoring
[14:09:17 INF] Switch condition check: Expected=broad, Extracted=ignore, Match=False
[14:09:18 INF] Microsoft.Agents.AI.Workflows.TurnToken
[14:09:18 INF] Received TurnToken in condition evaluation, ignoring
[14:09:18 INF] Switch condition check: Expected=combined, Extracted=ignore, Match=False

I'm running the workflow as a stream via a handoff builder:

var searchWorkflowAgent = await searchWorkflow.BuildAsync(agentContext, cancellationToken);
AIAgent workflowAgent = await AgentWorkflowBuilder.CreateHandoffBuilderWith(askAnythingAgentInstance)
    .WithHandoffs(askAnythingAgentInstance, [searchWorkflowAgent])
    .WithHandoffs(searchWorkflowAgent, [askAnythingAgentInstance])
    .Build()
    .AsAgentAsync();
await foreach (var response in workflowAgent.RunStreamingAsync(message, agentThread, options, cancellationToken: cancellationToken))

I've been following this guide:
https://github.com/microsoft/agent-framework/blob/main/dotnet/samples/GettingStarted/Workflows/ConditionalEdges/02_SwitchCase/Program.cs

Using .NET / Agent Framework: 1.0.0-preview.251009.1

[moonbox3]

Adding @TaoChenOSU / @lokitoth to help comment.