Considering I have simple class, that I just want to initialize (or do some task once in a lifetime of the object). Does switching the reference to Task.Completed after all is done change anything, considering GC?

    public class EmployeesAtPremisesAfterWork
    {

        private ConcurrentHashSet<int> isAtPremisesAfterWork = new ConcurrentHashSet<int>();
        public Task WaitUntilInitialized;

        public EmployeesAtPremisesAfterWork(SomeInitializationHelper helper)
        {
            WaitUntilInitialized = Task.Run(async () =>
            {
                var attachedValues = await helper.GetEmployeeAttachedValues();

                isAtPremisesAfterWork.AddRange(attachedValues.AtPremisesAfterWork);

                WaitUntilInitialized = Task.CompletedTask;
            });
        }
    }

I was just curious, since I still am not really sure about things GC related. Does Task keep reference to its context, after it is finished, or does it release it?