Steam doesn't fully close for a while even after it "shuts down"

Even after Steam "shuts down", the icon persists for a while. This duration seems to increase if the app has been open longer, but I don't have evidence yet. This only started occurring recently.

This delays a system reboot or shutdown quite a bit since steam needs to fully close before the system can stop.

Is there a reason this happens, and can it be fixed?
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