redpine: Bluetooth doesn't come back up after being soft killswitched

After turning Bluetooth off in software (via phosh quick settings or g-c-c), it never comes back on until the whole card is power cycled (for instance via hardware killswitch).

bluetoothctl shows Powered: no. Trying to power the adapter on shows:

[bluetooth]# power on
Changing power on succeeded

...but the adapter's status does not change.