It's a frustrating situation. I had a stretch in my career when I was the clean up person who did the 90% of work that was left after management thought a junior had gotten in 90% done. It's potentially very satisfying but very easy to feel unappreciated in (e.g. they wish the junior could have gotten it done and thought I was "too slow" though in retrospect one year of that was an annus mirabilis where I completed an almost unbelievable number of diverse projects.)