This might be a problem with transformers. Did you try without transformers at all? See my comments in https://bugzilla.redhat.com/show_bug.cgi?id=1572341#c2
We haven't tried without transformers, I can suggest to do polling without these.
We tried workload_partitioning=true without any improved success. (Guidance from this BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1520694).
I will pass this feedback to the customer. Thank you very much for the help!
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