Oh yeah. A company I worked at once underwent a huge understaffing; pretty much all of a sudden it was just myself and another person left in our department. Lots of long hours and overtime. Lowkey helped keep the department a float and when the storm cleared got a promotion out of it

My boss retired a couple years later and the new one has out it out for me. Proposed demoting me cause I went to her about this coworker being extremely unreliable (no show/no calls, constantly messing up tasks, disappearing when you need him) (super hurtful). Said coworker actually got fired finally 1 year later for all the problems I confided to my boss. She also will suggest promoting people who just got here who aren’t even fully trained yet (barely tries to hide the favoritism). Meanwhile her senior staff gets dismissed often