为什么逻辑调用上下文不跨线程传播？

我有一个奇怪的问题,逻辑调用上下文没有传播到我的应用程序中的线程.

在此示例中,线程(在设置逻辑调用上下文数据之前创建)不会获取新值:

class Program
{
    static void Main(string[] args)
    {
        var dispatcher = new MessageDispatcher();

        //Logical call context data not set yet
        Console.WriteLine($"Main: {Thread.CurrentThread.ManagedThreadId}: {CallContext.LogicalGetData("myvar")}"); // Main logical call context data is not set yet = Null
        dispatcher.Broadcast("a string"); // logical call context data is still not set yet = Null

        //Logical call context data is set now
        CallContext.LogicalSetData("myvar", "Logical call context variable");
        Console.WriteLine($"Main: {Thread.CurrentThread.ManagedThreadId}: {CallContext.LogicalGetData("myvar")}"); // Main logical call context data is set = return value

        dispatcher.Broadcast("a string"); // Logical call context data is set and should return the data set above?

        Console.ReadLine();
    }
    public class MessageDispatcher
    {
        private readonly ConcurrentQueue _messages;
        private readonly AutoResetEvent _waitHandle;
        private bool _terminate;
        private bool _messageMonitoringActive;

        public MessageDispatcher()
        {
            _messages = new ConcurrentQueue();
            _waitHandle = new AutoResetEvent(false);

            var thread = new Thread(MonitorCollection);
            thread.Start();
        }

        public void Broadcast(string message)
        {
            _messages.Enqueue(message);
            _waitHandle.Set();
        }

        private void MonitorCollection()
        {
                _waitHandle.WaitOne();

                string message;
                while (_messages.TryDequeue(out message))
                {
                    Console.WriteLine(
                        $"{message}: {Thread.CurrentThread.ManagedThreadId}: {CallContext.LogicalGetData("myvar")}");
                }
        }
    }
}

CallContext.LogicalSetData("myvar", "Logical call context variable");

var dispatcher = new MessageDispatcher();