CircuitPython Locks Up on Disconnect

Using the current time service example on a Adafruit Feather nRF52840 Sense with CircuitPython 5.3 (and on 5.4-beta1):

https://github.com/adafruit/Adafruit_CircuitPython_BLE/blob/master/examples/ble_current_time_service.py

I connected the sense with my android phone running the Nordic nRF Connect for Mobile app.

Upon connecting to the sense, it proceeds to print the current time. If you disconnect from the sense via the app (close the tab), depending upon the timing of the disconnect, the sense will either print disconnected, as expected, or lock-up. When it's locked up, it appears that its hung up on the cts.current_time statement (line 28). Because of the delay between the time the app disconnects from the sense and the time the sense detects the disconnect, the program attempts to retrieve the current time even though it is really disconnected. You can increase the odds of reproducing this by changing time.sleep(1) in line 29 to time.sleep(0.1).

When locked-up, it becomes unresponsive and you have to manually reset the board.