ConcurrentBag that uses ConcurrentDictionary wtih ManualResetEventSlim to allow to wait on removal of a specific item

ConcurrentWaitableBag.cs

    public class ConcurrentWaitableBag<T> where T : notnull
    {
        private ConcurrentDictionary<T, ManualResetEventSlim> dict = new ConcurrentDictionary<T, ManualResetEventSlim>();

        public bool TryAdd(T item)
        {
            var semaphore = new ManualResetEventSlim(false);
            return dict.TryAdd(item, semaphore);
        }

        public bool TryRemove(T item)
        {
            if (dict.TryRemove(item, out var manualResetEvent))
            {
                manualResetEvent.Set();
                manualResetEvent.Dispose();
                return true;
            }
            return false;
        }

        public ManualResetEventSlim? GetRemoveEvent(T item)
        {
            if (dict.TryGetValue(item, out var manualResetEvent))
            {
                return manualResetEvent;
            }
            return null;
        }


        public bool ContainsKey(T item) => dict.ContainsKey(item);
    }