inkyframe "inkylauncher" shows nothing (other exemples work) with v1.20.5

[diplodocuslongus]

Could there be anything wrong with the inkylauncher example together with the latest .uf2 (pimoroni-inky_frame-v1.20.5-micropython.uf2)?
The display blinks as usual when it's being refreshed but ends up grey with nothing shown along the way nor at the end.
The inky_frame_dithering.py and button_demo.py examples show the expected graphic on my inky 4.

I've added some debug prints to be shown in the thonny console, I can follow along as world_clock.py is executed, can't connect to ntp server but do return the proper approximate time string, the draw function is called, and main.py ends up sleeping, after having called ih.app.draw(). So all is properly executed, just the display shows nothing (besides the temporary blinking activity).

(edit) P.S. I can see the launcher function being called (with more debugging prints) when pressing A+E+reset but I get the same behaviour of a blinking screen with nothing shown at the end.
Also I did make sure that the DISPLAY setting is correct for the inky 4.