Dataprocessing: multiple processors writing out to one file have same header name

Summary

Like in the screenshot, processor 1 and 6 write to the same file (each processor may have different settings). In the .csv file the top looks like this:

timeStep pedestrianId countingDensity countingDensity
1 1 3.2538343921009716 2.5464790894703255
1 2 2.4050080289441964 1.6269171960504858
1 3 2.2635369684180673 1.6976527263135504

So there is a header naming issue and there is no reassurance which column belongs to which processor.

What is the expected correct behavior?

Handle name mangling in this case!