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When the device asks the host to wake up, the driver can decide the host has answered even when it hasn't because of an obsolete SOF flag value. The device then switches to active and stays that way, although nothing is talking to it. This is easiest to see with a PC that is shut down but still powers its USB ports: pressing a key "wakes" the device, and it never returns to suspend.
This is a bug because this behavior doesn't conform to USB spec.
I confirmed this fixes the issue for my QMK keyboard.