How consume Kafka messages from a topic with multiple avro schemas using C# and Confluent.Kafka

Question

I need consume messages from one topic that have multiple avro schemas.

I using a c# lib Confluent.SchemaRegistry and Confluent.Kafka for make my consumer.

I tried to use a GenericRecord Type to deserialize the message without pass the avro schema, but the serialization not working well because return a string with invalid json format.

public IConsumer<string, GenericRecord> Consumer =>
    new ConsumerBuilder<string, GenericRecord>(_consumerConfig)
        .SetValueDeserializer(new AvroDeserializer<GenericRecord>(
            new CachedSchemaRegistryClient(_schemaRegistryConfig)).AsSyncOverAsync())
        .Build();    

var consumer = _kafkaClienteConsumerFactory.Consumer; 
consumer.Subscribe(_configuration["Kafka:Topic"]);
result = consumer.Consume();
Mensagens.Add(result.Message.Value.ToString());