Hi ,
After upgrading Mongodb C# driver to version 2.25.0, some of my queries are break and throw exception when using ElemMatch. It works fine in version < 2.18.0.
My class look likes :

 [MongoCollection(ObjectType = "Item")]
 [BsonIgnoreExtraElements]
 public class Item
 {
  
     public IEnumerable<string> RelativeItemIds { get; set; }
 }

and my old query look like :

  var builder = Builders<Item>.Filter;
  var listRefIds = new List<string>{refId};
  var filter = builder.ElemMatch(t => t.RelativeItemIds , t => listRefIds .Contains(t));
var data =  await Collection.Find(filter).ToListAsync();

The exception is :

unable to cast object of type 'MongoDB.Bson.Serialization.Serializers.StringSerializer' to type 'MongoDB.Bson.Serialization.IBsonDocumentSerializer

Could someone please help me to resolve it?