My wife has encountered several times between the Junglewurm and Shadow Behemoth, that she has participated through the entire event and not received anything for her efforts.
I and she are quite certain that she has done damage to the main target. Not sure if there is anything that can be done on our end.
Has anyone else had issues with this, or maybe it is due to some kind of lag? It does happen when these events are the Daily events.