Kafka Streams 4.1.2 offsets not being committed after upgrade from Spring Boot 3.5.8 to 4.0.5

Hello Kafka users, I am looking for help with a Kafka Streams offset commit issue that started after upgrading. We have a Spring Cloud Stream application using the Kafka Streams binder. Old working stack: * Spring Boot 3.5.9 * Spring Cloud 2025.0.0 * spring-cloud-stream-binder-kafka-streams 4.3.0 * kafka-streams 3.9.1 New stack with the issue: * Spring Boot 4.0.5 * Spring Cloud 2025.1.1 * spring-cloud-stream-binder-kafka-streams 5.0.1 * kafka-streams 4.1.2 Broker version: * Kafka brokers 3.9.0 Symptoms: * The Kafka Streams application processes new records normally. * However, committed offsets for the Streams application do not appear to advance. * In Kafka UI, consumer group lag stays high for all partitions, while application-level metrics show near real-time processing of new events. * On restart, the application starts reading from the beginning of the topic again. * When I set auto.offset.reset=none, startup fails with: org.apache.kafka.streams.errors.StreamsException: No valid committed offset found for input [myTopic] and no valid reset policy configured Important notes: * application.id is explicitly configured and static. * The same topology and configuration on the older stack works fine and retains offsets across restart. I have only a basic familiarity with the Kafka Streams internals, but while debugging StreamTask in 4.1.2, I see commit paths being reached even though no actual offsets seem to be committed. Has anyone seen this in 4.1.x, or does this match any known issue? Any pointers, similar bug reports, or things I should inspect next would be greatly appreciated. Thanks