SetPartitionsLostHandler not called on group loss

[alex-zyl]

Description

SetPartitionsLostHandler and SetPartitionsRevokedHandler handlers are not invoked when consumer loses consumer group due to exceeded poll interval.

How to reproduce

Confluent.Kafka Verion 2.6.1

Consumer setup

var consumer = new ConsumerBuilder<string, string>(new ConsumerConfig
        {
            BootstrapServers = config["Kafka:BootstrapServers"],
            GroupId = "your-group-id",
            AutoOffsetReset = AutoOffsetReset.Earliest,
            MaxPollIntervalMs = 15000,
            SessionTimeoutMs = 10000
        })
                .SetPartitionsLostHandler((consumer, list) =>
                {
                    _logger.LogInformation("Partitions lost");
                })
                .SetErrorHandler((consumer, error) =>
                {
                    _logger.LogInformation(error.Reason);
                })
                .Build();

var message1 = consumer.Consume();

await Task.Delay(Timespan.FromSeconds(30));
// Here, the following warning message is logged 
// [thrd:main]: Application maximum poll interval (15000ms) exceeded by 7ms (adjust max.poll.interval.ms for long-running message processing): leaving group

// Subsequent Consume() raises ConsumeException with ErrorCode.Local_MaxPollExceeded
var message2 = consumer.Consume();

Expected Result

SetPartitionsLostHandler is invoked on partitions ownership loss.

Actual Result

Only SetLogHandler is invoked.

Checklist

Please provide the following information:

• A complete (i.e. we can run it), minimal program demonstrating the problem. No need to supply a project file.
• Confluent.Kafka nuget version.
• Apache Kafka version.
• Client configuration.
• Operating system.
• Provide logs (with "debug" : "..." as necessary in configuration).
• Provide broker log excerpts.
• Critical issue.