The test case PubSub Publisher UADP chunking / TC 006 in TestCaseDefinition_PubSub_5 says "Check static Fields" with an expected result of "Static Fields must remain static over time".
It needs to be clarified which fields are to be tested here exactly.
Header fields are already tested in previous tests and the payload has no static fields, if chunk messages for multiple payloads are received.

The overall chunking test cases need to be more precise about whether the received chunks must belong to the same payload or not, as this decides about some fields being static or not.