When running test UnmarshalMarshalTest, a lot of tests fail with similar output [1]. It looks like it is related to getting nulls here when reading attribute prefixes [2].

[1] https://gist.github.com/baldimir/bbb58fb1dfb3df41b74c012d54895ce9
[2] https://github.com/kiegroup/drools/blob/b007d9d50d5fa9f7eb4c645f298765dab5f28878/kie-dmn/kie-dmn-backend/src/main/java/org/kie/dmn/backend/marshalling/CustomStaxReader.java#L80