Changing default CosmosSerializationOptions to camelCase causes an exception in CosmosDB SDK V4

Describe the bug I have a problem with a CosmosDB SDK V4.0.0-preview3. When I try to change default CosmosSerializationOptions it causes an exception when I try to use GetItemQueryIterator. Everything else except this method works fine.

To Reproduce

var client = new CosmosClientBuilder(connectionString)
    .WithSerializerOptions(new CosmosSerializationOptions { PropertyNamingPolicy = CosmosPropertyNamingPolicy.CamelCase })
    .Build();
var container = client.GetContainer("SocialNetwork", "Posts"); 
var query = new QueryDefinition("SELECT * FROM c");
await foreach (var item in container.GetItemQueryIterator<Post>(query))
{
    Console.WriteLine(item);
}

Actual behavior Exception message:

Unhandled exception. System.ArgumentNullException: Value cannot be null. (Parameter 'source')
   at System.Linq.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Azure.Cosmos.CosmosResponseFactory.CreateQueryFeedResponseWithSerializer[T](Response cosmosResponseMessage, CosmosSerializer serializer)
   at Azure.Cosmos.CosmosResponseFactory.CreateQueryFeedResponse[T](Response cosmosResponseMessage)
   at Azure.Cosmos.PageIteratorCore`1.GetPageAsync(String continuation, CancellationToken cancellationToken)
   at Azure.Cosmos.PageResponseEnumerator.FuncAsyncPageable`1.AsPages(String continuationToken, Nullable`1 pageSizeHint)+MoveNext()
   at Azure.Cosmos.PageResponseEnumerator.FuncAsyncPageable`1.AsPages(String continuationToken, Nullable`1 pageSizeHint)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
   at Azure.AsyncPageable`1.GetAsyncEnumerator(CancellationToken cancellationToken)+MoveNext()
   at Azure.AsyncPageable`1.GetAsyncEnumerator(CancellationToken cancellationToken)+MoveNext()
   at Azure.AsyncPageable`1.GetAsyncEnumerator(CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
   at ConsoleAppCosmosDb.Program.Main(String[] args) in C:\Users\XPS\source\repos\ConsoleAppCosmosDb\ConsoleAppCosmosDb\Program.cs:line 29
   at ConsoleAppCosmosDb.Program.Main(String[] args) in C:\Users\XPS\source\repos\ConsoleAppCosmosDb\ConsoleAppCosmosDb\Program.cs:line 29
   at ConsoleAppCosmosDb.Program.<Main>(String[] args)

If I remove this option or change CamelCase to Default everything works.

Environment summary SDK Version: 4.0.0-preview3 OS Version: Windows 10

[eskaufel]

I was playing with an idea. I often use preview when I know the timeline is considerably into the future. I was also hoping to use just one serializer across the project. In the end, the name preview3 made me think v4 was closer to a release than it is.

[ealsur]

@eskaufel I understand the concern, currently V4 is an experimental version, not meant for production usage, and the efforts are mainly put to harden and improve V3, which acts as a base of V4. There is no ETA for V4 GA.

Since V4 is only experimental and preview, why are you currently using it? Are you doing some POC? Why not use V3 SDK instead? What are the reasons you are currently using V4?