Good find @Michael99645,
That seems like the kind of hidden issue that would drive you crazy if you ran into it without knowing what you were looking at. That article documents the problem well and will be a great resource for us makers using the Pico 2.
If I had to guess at the reasoning behind the 5V printing on the silk screen it would be that it is meant to indicate the maximum voltage that the pin can take as per the contact power rating on the datasheet. Of course, this doesn’t make this any less confusing for practical use as Trevor has found out. This being labelled more directly as +V, VCC or a more appropriate term would be better.
I will make sure the product page gets a note added about this pin. Thanks for bringing it to our attention! 
Hi All
As a point of interest it would not matter if you reversed the V and Gnd connection. All that would happen would be the output reversed ie; switch closes - positive V output. Logic would have to be reversed too such as interrupts on rising instead of falling.
Cheers Bob
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Hi Trevor
The push button has no de bounce filter so when it is pulled low it does not have a 10kΩ resistor forming a voltage divider with the internal pull up which will be the case with the rotary switches.
Cheers Bob
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Hi Samuel
I was pretty slack for not spotting this when I was experimenting 18 months ago. I might not have noticed as I try to stay with 5V and keep as far away from 3.3V as I can. But there again I am pretty backward aren’t I.
I was also experimenting with Arduino to check for missed counts so needed 5V.
Cheers Bob
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