Just checking, what device is this on? MDBT42?
I can reproduce it here too - a simple setWatch(print,...) is enough. It definitely seems broken somehow - I've filed an issue at https://github.com/espruino/Espruino/issues/1902
Without debounce you'd expect that you would get multiple events though, just because sometimes the noise is so fast that my the time the IRQ handler fires the pin has already changed state.
But that obviously shouldn't cause issues with the debounce.
You should be able to work around it pretty easily if you need to just be doing some debouncing yourself though - because I imagine you're only really interested in the falling edge.
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