Deserializing subsetted resources using System.Text.Json

[robrez]

I have some code that makes an api call to an external fhir server.. eg:

fhir.com/Encounter?_elements=id,subject,serviceProvider

Whose response I'm attempting to deserialize via..

using var stream = await responseMessage.Content.ReadAsStreamAsync(cancellationToken);
var jsonSerializerOptions = new JsonSerializerOptions().ForFhir(ModelInfo.ModelInspector);
return await JsonSerializer.DeserializeAsync<T>(stream, jsonSerializerOptions);

I cannot seem to figure out how to get this to not raise exceptions. I see in the docs that I can create a Serializer using SerializationFilter.ForElements(...).

The only thing I've been able to try above is setting mode to Ostrich or catching the resulting DeserializationFailedException and returning the PartialResult.. each seem "off".

For broader context on the code snippet above... something like that is inside of a "named client" which I use to make requests to several various fhir calls... this code isn't aware of anything specific about the request. The requester configures the resource/parameters and delegates to the named client. T in the example above is a Bundle whose entries would be Encounter resources since the URI is encounter