Cannot use "contains" on nullable enums

[tuxinal]

I have a scenario in my codebase where I need to check if a nullable enum property is in a list determined from an external source

Code sample

/*
 Dotnet version: 8.0.412
 Redis Version: 8.0.3
 Redis OM version: 1.0.1
*/
using Redis.OM;
using Redis.OM.Modeling;

var provider = new RedisConnectionProvider("redis://localhost:6379");
provider.Connection.CreateIndex(typeof(BillCache));
var billCollection = provider.RedisCollection<BillCache>();

billCollection.Insert(new BillCache { Id = 1, ItemType = ItemType.Item0 });
billCollection.Insert(new BillCache { Id = 2, ItemType = ItemType.Item1 });
billCollection.Insert(new BillCache { Id = 3, ItemType = ItemType.Item2 });
billCollection.Insert(new BillCache { Id = 4, ItemType = ItemType.Item3 });
billCollection.Insert(new BillCache { Id = 5, ItemType = null });

ItemType[] matches = [ItemType.Item0, ItemType.Item1, ItemType.Item2];

var query = billCollection.Where(x =>
    matches.Contains((ItemType)x.ItemType!)
);
Console.WriteLine($"Redis query: {query.ToQueryString()}");
var response = query.ToList();

[Document(StorageType = StorageType.Hash, IndexName = "bill-idx")]
class BillCache
{
    [Indexed]
    [RedisIdField]
    public int Id { get; set; }
    [Indexed]
    public ItemType? ItemType { get; set; }
}

enum ItemType
{
    Item0 = 0,
    Item1 = 1,
    Item2 = 2,
    Item3 = 3,
}

The query string output in this scenario is "FT.SEARCH" "bill-idx" "(Item0|Item1|Item2:{\@ItemType})" "LIMIT" "0" "100" which results in a syntax error.
The expected output would be "FT.SEARCH" "bill-idx" "(@ItemType:[0 0]|@ItemType:[1 1]|@ItemType:[2 2])" "DIALECT" "2" "LIMIT" "0" "100"
it seems that 1. the left and right side of the condition are flipped and 2. the enums aren't being parsed as integers