Flag cannot be deserialised if using "hide sensitive data" + non-Edge API

[rolodato]

using Flagsmith;

var flagsmithClient = new FlagsmithClient("ser...", "https://example.flagsmith.com/api/v1/");
var flags = await flagsmithClient.GetEnvironmentFlags();
Console.WriteLine(flags.AllFlags());

If the target environment has "Hide sensitive data" enabled, this fails with:

Details

Unhandled exception. Newtonsoft.Json.JsonSerializationException: Error converting value {null} to type 'System.Int32'. Path '[0].id', line 1, position 11.
 ---> System.InvalidCastException: Null object cannot be converted to a value type.
   at System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.EnsureType(JsonReader reader, Object value, CultureInfo culture, JsonContract contract, Type targetType)
   --- End of inner exception stack trace ---
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.EnsureType(JsonReader reader, Object value, CultureInfo culture, JsonContract contract, Type targetType)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.SetPropertyValue(JsonProperty property, JsonConverter propertyConverter, JsonContainerContract containerContract, JsonProperty containerProperty, JsonReader reader, Object target)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateObject(Object newObject, JsonReader reader, JsonObjectContract contract, JsonProperty member, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateObject(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateList(IList list, JsonReader reader, JsonArrayContract contract, JsonProperty containerProperty, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateList(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue, String id)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateValueInternal(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerMember, Object existingValue)
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
   at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
   at Newtonsoft.Json.JsonSerializer.Deserialize(JsonReader reader, Type objectType)
   at Newtonsoft.Json.JsonConvert.DeserializeObject(String value, Type type, JsonSerializerSettings settings)
   at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value, JsonSerializerSettings settings)
   at Newtonsoft.Json.JsonConvert.DeserializeObject[T](String value)
   at Flagsmith.FlagsmithClient.GetFeatureFlagsFromApi()
   at Flagsmith.FlagsmithClient.GetFeatureFlagsFromCorrectSource()
   at Flagsmith.FlagsmithClient.GetEnvironmentFlags()
   at Program.<Main>$(String[] args) in /Users/rolodato/source/flagsmith/FlagsmithExample/FlagsmithExample/Program.cs:line 6
   at Program.<Main>(String[] args)

Process finished with exit code 134.

This does not happen with the Edge API - compare these responses:

% curl 'https://edge.api.flagsmith.com/api/v1/flags/' -H 'x-environment-key: PPaxBNpveqUsX27RKtNaps'
[{"feature": {"id": 118078, "name": "my_feat", "type": "STANDARD"}, "enabled": false, "feature_state_value": null}

% curl 'https://api.flagsmith.com/api/v1/flags/' -H 'x-environment-key: PPaxBNpveqUsX27RKtNaps'
[{"id":null,"feature":{"id":118078,"name":"my_feat","created_date":null,"description":null,"initial_value":null,"default_enabled":null,"type":"STANDARD"},"feature_state_value":null,"environment":null,"identity":null,"feature_segment":null,"enabled":false}]