SignalR Backplane with ElastiCache Serverless

The problem with SignalR Backplane (StackExchange.Redis) with ElastiCache Serverless. It worked with Redis in the K8S cluster. In total, we came to a case where Pub/Sub are signed correctly, but messages sent by clients (hubs) arrive and display an error on the ElastiCache side: <Invalid UTF-8 data>. Payload messages are serialized by MessagePack.

When testing locally (Redis Docker), the correct message is displayed when I connect to the channel via redis-cli.
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