Badger 2040 W - 'picographics' object has no attribute 'sleep_for'

I’ve written a bit of code for a brand new Badger 2040 W, it all works as expected, but I can’t get the sleep_for() function to work.

I’ve cut the code down to the bare minimum

import badger2040
badger = badger2040.Badger2040()

The error returned is

MPY: soft reboot
Traceback (most recent call last):
  File "<stdin>", line 3, in <module>
  File "", line 171, in __getattr__
AttributeError: 'picographics' object has no attribute 'sleep_for'

The fuller code can connect to wifi, update the screen, turn the LED on and off etc without issue.

I’ve flashed my badger with the latest firmware for the Badger W (also tried without badger os) -

I’m using Thonny 4.1.1 to run the code on a windows 10 PC. Have also tried running the code saved as when connected to a battery supplying 4v.