I had the same problem on 5.5.1 for a single consumer. For some weird reason messages poked into the broker within ~200ms or less, they came out in different order as they came in. I had to fix it from the producer side delaying ordered messages be sent one per second. Since that, the consumer receives the messages in order as they should and it working nicely since more than a year. I made some test on 5.6.0 and it seems okay, but I can not guarantee that because a very l imitated text fixtures were performed.
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