HID keyboard won't release keys when called via schedule

Calling KeyboardInterface().send_keys() from a function called via micropython.schedule() doesn't seem to allow keys to be released, causing a spamming issue. This code reproduces the issue:

import usb.device
from usb.device.keyboard import KeyboardInterface
from time import sleep_ms
from micropython import schedule

KBD = None

def send_keys(foo):
    keys = [-0x02, 5]
    print("sending keypress")
    KBD.send_keys(keys)

    keys.clear()
    print("clearing keypress")
    KBD.send_keys(keys)


def main():
    global KBD
    KBD = KeyboardInterface()
    usb.device.get().init(KBD, builtin_driver=True)

    sleep_ms(5000)
    print("starting loop")

    while True:
        send_keys(None)
        # schedule(send_keys, None)
        sleep_ms(3000)

if __name__ == '__main__': main()

running schedule(send_keys, None) instead of send_keys(None) causes a flood of 🅱️, this is on a Pico running 1.23.0 and whatever the latest version of usb-device-keyboard is currently in mip.

Inizia con KeyboardInterface.send_keys e confronta il suo comportamento quando viene chiamato direttamente con quello ottenuto tramite micropython.schedule, usando la riproduzione mostrata nell’issue. Conferma la causa su un Pico con MicroPython 1.23.0, quindi verifica che le pressioni dei tasti pianificate vengano rilasciate correttamente senza produrre input ripetuti.