It's probably because you're using the standard Bangle.js firmware?
As soon as the IRQ pin changes, the firmware itself jumps in and processes the IRQ before the JS can get there. That may even be the reason you can't get the watch working.
I think you're not going to get anywhere with this unless you make your own build that completely disables Bangle.js's touch functionality - which is probably not what you want!
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