Feather RP2040 alarm.wake_alarm not set upon wake from deep sleep

[dlizotte-uwo]

CircuitPython version

Adafruit CircuitPython 7.1.0 on 2021-12-28; Adafruit Feather RP2040 with rp2040

Code/REPL

import alarm
import board
import digitalio
import neopixel
import time

np = neopixel.NeoPixel(board.NEOPIXEL, 1)

# Off for 1 second
np[0] = (0,0,0)
time.sleep(1)

if alarm.wake_alarm is not None:
    # red if woke from sleep
    np[0] = (50,0,0)
else:
    # blue if not woke from sleep
    np[0] = (0,0,50)

# Create a an alarm that will trigger 5 seconds from now.
time_alarm = alarm.time.TimeAlarm(monotonic_time=time.monotonic() + 5)
# Exit the program, and then deep sleep until the alarm wakes us.
alarm.exit_and_deep_sleep_until_alarms(time_alarm)

Behavior

alarm.wake_alarm is None upon wake from deep sleep on the Feather RP2040 when not connected over USB. (Using battery.)

It is set in "fake" deep sleep when connected over USB.

This example uses TimeAlarm; I saw it happen with PinAlarm also.

Description

Seems to be same issue as #5343 but only in real deep sleep

Additional information

No response

Having similar issue, I can tell its a PinAlarm on wake, but it doesnt tell me which pin...
wake_alarm.pin = None
wake_alarm.value = False

import alarm
from alarm.pin import PinAlarm
import board
import time

if alarm.wake_alarm is not None:
    print (alarm.wake_alarm)
    # print (isinstance(alarm.wake_alarm, PinAlarm))
    print (alarm.wake_alarm.pin)
    print (alarm.wake_alarm.value)
print ('this is my app')
time.sleep(3)

p = PinAlarm(pin=board.GP0, value=False, pull=True)
alarm.exit_and_deep_sleep_until_alarms(p)

Workaround...read the button immediately at start, be sure to deinit() it before sleep...

import alarm
from alarm.pin import PinAlarm
import board
from digitalio import DigitalInOut, Pull
import time

btn = DigitalInOut(board.GP0)
btn.switch_to_input(pull=Pull.UP)
print ('Got a value: ', btn.value)
btn.deinit()
time.sleep(3)

p = PinAlarm(pin=board.GP0, value=False, pull=True)
alarm.exit_and_deep_sleep_until_alarms(p)