Bangle.js 2 button stuck

does the board look corroded in any way?
nope, I'm attaching an image even if my smartphone sucks a bit...
I also disassembled the rear part and there are no signs of humidity or corrosion.

the last time it worked, I used it in a cold environment but considering that it was always worn and under the jacket, I don't think it ever went below 10°C.

I only noticed one thing, in the part "circled" in red, there seems to be 2 soldering points but there is no component.
is it missing or is it correct like this?

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