Web Workflow Welcome Page Causes Program Pause

[safferyj]

CircuitPython version

9.0.3 and 9.1.0-beta.0 on Unexpected Maker FeatherS2 Neo and Adafruit Feather ESP32-S2 Reverse TFT

Code/REPL

import board
import digitalio
import microcontroller
import time
import watchdog 
import wifi

#print(f"Start ({microcontroller.cpu.reset_reason})")
print(f"IP address: {wifi.radio.ipv4_address}")

# LED
led = digitalio.DigitalInOut(board.LED)
led.direction = digitalio.Direction.OUTPUT

# Watchdog
dog = microcontroller.watchdog
dog.timeout = 60
dog.mode = watchdog.WatchDogMode.RAISE

while True:

    for i in range(15):

        # Feed the watchdog
        dog.feed()

        led.value = True
        print(".", end="")
        time.sleep(1)

        led.value = False
        print(".", end="")
        time.sleep(1)

    print()

Behavior

Accessing the Welcome page of the web workflow can cause the executing program to pause. With the above code, the LED stops flashing. Clicking on the Full Code Editor link causes the program to resume.

Description

This issue does not seem to happen in 8.2.10.

Additional information

With the above code, if the pause happens and you wait more than a minute, then resuming by entering the Full Code Editor leads to an immediate watchdog exception.