I've got a bag delayed on LH/OS itinerary last week. PIR was filled via LO (as I arrived rerouted on a LO flight in the end), and worldtracer had not been updated until the bag was being delivered.
I was able to trace the bags through the LH app. That told me both bags weren't loaded to my WAW rerouted flight, instead one was put on a later direct flight and one was left in Vienna, noted the following morning as being accepted for the next available flight.
It would make it easier for me if the same could be seen in WorldTracer, at least for the peace of mind.
Not that anybody even looked in there it seems - my phone number was mistyped in there and I've left a note through web interface, but it was not acted upon. I had to call the airport to notify them.