<PackageReference Include="System.Text.Json" Version="11.0.0-preview.2.26159.112" />

System.Text.Json.Serialization.JsonUnmappedMemberHandling

Determines how JsonSerializer handles JSON properties that cannot be mapped to a specific .NET member when deserializing object types.
namespace System.Text.Json.Serialization { public enum JsonUnmappedMemberHandling { Skip, Disallow } }