Problem: Work Performance can increase during work, however when the Sim finishes for the day, it drops down by several 'clicks' suddenly.
When observed: Sim on Literary Track 'Novelist'
Reason/cause: The bug is introduced when the Sim has the "Get a promotion" whim (To earn 100 points).
Workaround: Cancel the whim and the work performance level won't drop after finishing work for the day.
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answers.ea.com/t5/The-Sims-4-Bug-Reports/Sim-Work-Performance-Sudden-Drop-Bug-with-known-cause/m-p/4177532#U4177532