Strange BTN1 behaviour on Bangle.js 2

Wow, that is an odd one. You could try pinMode(BTN1,'pulldown') and see if that helps?

No... Only the simple pinMode statetment seems to help. Odd...

>setInterval(function(){print(digitalRead(BTN1))},1000)
=4
0
0
// Multiple BTN1 presses
0
0
0
0
0
0
0
0
0
0
0
0
>pinMode(BTN1,"input_pulldown")
=undefined
0
// Multiple BTN1 presses
0
0
0
0
0
0
0
0
0
>pinMode(BTN1)
=undefined
0
// 1 BTN1 press
0
1
>
 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v10.89 (c) 2021 G.Williams
> 

Remark the Espruino prompt at the bottom : after a (detected) BTN1 press, I see the Settings/About/... screen, but no responses to BTN1 anymore. Also the setInterval seems to have stopped ??

When you do pinMode do the 0 and 1 correspond to your actual button presses or are they random?

The 0/1 values follow the BTN1 presses

If you're pressing the button for >1 second then you'd expect the Loading screen to appear though as it tries to reload the default app - could that be it?

I don't think so. I've tried to 'quickly' press BTN1. This is below 1 second, I guess

Also when it's not working could you run getPinMode(BTN1) and...

>
>getPinMode(BTN1)
="input_pulldown"
> 

Strange...

I continued my search after I discovered the factory reset function. This should really put everything back to a know state, I suppose. I then installed a simple setWatch :

>
>Bangle.factoryReset()
Erasing Storage Area...
Erase complete.
Writing initial storage contents...
Write complete.
=undefined
>setWatch(function(){print("Yes!")},BTN1, {edge:"rising", debounce:50, repeat:true})
=2
>
// BTN1 presses, no result
>
>
>pinMode(BTN1)
=undefined
> 
// BTN1 presses, no result !!!???

Next I uploaded Espruino's RAM, where I found something strange - to me at least :

//...
setInterval(function (undefined) {return WIDGETS["bat"].draw()}, 60000); // 3
// [native code]????
setWatch(function () { [native code] }, D17, { repeat:true, edge:'falling', debounce : 24.99961853027 });
setWatch(function () {print("Yes!")}, D17, { repeat:true, edge:'rising', debounce : 49.99923706054 });
// Code saved with E.setBootCode
//...

Is that '[native code]' part supposed to be there ?