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Failed to deserialize exception from TaskActivity

See original GitHub issue

Microsoft.Azure.WebJobs.Extensions.DurableTask v1.6.2

Issue

If you have an orchestrator call a sub orchestrator and that sub orchestrator calls an activity function which throws an exception, then the exception cannot be deserialised and you get “Failed to deserialize exception from TaskActivity”

Easy to reproduce like this:

public class MyOrchestrator

{
    [FunctionName("MyTimer")]
    public static async Task RunTimerAsync([TimerTrigger("0 */5 * * * *", RunOnStartup = true)]TimerInfo myTimer, [OrchestrationClient]DurableOrchestrationClient orchestrationClient, ILogger log)
    {
        log.LogInformation($"Executing");

        string instanceId = await orchestrationClient.StartNewAsync("MyOrchestrator", "Test");

        
    }


    [FunctionName("MyOrchestrator")]
    public static async Task RunOrchestratorAsync([OrchestrationTrigger] DurableOrchestrationContext context, ILogger logger)
    {
        try
        {
            await context.CallSubOrchestratorAsync("MySubOrchestrator", "Booooo");
        }
        catch (Exception ex)
        {
            //The exception here is Failed to deserialize exception from TaskActivity:
        }
    }

    [FunctionName("MySubOrchestrator")]
    public static async Task RunSubOrchestratorAsync([OrchestrationTrigger] DurableOrchestrationContext context, ILogger logger)
    {
        await context.CallActivityAsync("MyActivityFunction", "Booooo");
    }

    [FunctionName("MyActivityFunction")]
    public static void RunActivityFunction([ActivityTrigger] DurableActivityContext context, ILogger logger)
    {
        throw new Exception("WTF");
    }
}