Usually, such issues appear when the JsonSerializerSettings of Newtonsoft.Json are set to use a PascalCase ContractResolver instead of a ContractResolver that resolves them with camelCase such as the CamelCasePropertyNamesContractResolver.
Where Newtonsoft.Json is added to the application, you should ensure that the CamelCasePropertyNamesConctractResolver is used or you can just call the NewtonsoftJsonMvcBuilderExtensions.AddNewtonsoftJson Method without additional settings:
services.AddNewtonsoftJson();
Currently, we have no plans to support PascalCase serialization and thus I will Decline this item.
Please let us know if you have any questions or if you need assistance.
Regards,
Dimitar
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