In our protobuf messages, we specify both the package and the csharp namespace. For example:

syntax = "proto3";

package iss.protobuf.digital_production;

import "google/protobuf/wrappers.proto";

option csharp_namespace = "Iss.Protobuf.DigitalProduction";

message DocumentDataSetInsertReply {
  enum Statuses {
    DOCUMENTDATAINSERT_STATUS_UNSPECIFIED = 0;
    DOCUMENTDATAINSERT_STATUS_COMPLETE = 1;
    DOCUMENTDATAINSERT_STATUS_FAILED = 2;
  }
  Statuses status = 1;
  google.protobuf.StringValue message = 2;
}

These messages do not deserialize correctly. The ConfluentProtobufTypeNameResolver returns "iss.protobuf.digital_production.DocumentDataInsertReply" instead of the expected "Iss.Protobuf.DigitalProduction.DocumentDataInsertReply".

I had hoped that I could pull the csharp_namespace from the FileDescriptorProto returned by the message parser. But when autoregistering the schema with the registry, it looks like the csharp_namespace attribute is filtered out of the stored schema.