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

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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()
badger.sleep_for(1)

The error returned is

MPY: soft reboot
Traceback (most recent call last):
  File "<stdin>", line 3, in <module>
  File "badger2040.py", 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) - https://github.com/pimoroni/badger2040/releases/download/v0.0.3/pimoroni-badger2040w-v0.0.3-micropython-with-badger-os.uf2

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