[...]AFAIU, FET is not implied when board is powered through usb, right?
What i did to short them is to insert a flat-ended screwdriver in the power input, then test for shortage, then plugged USB [...]
Very interesting symptom, sorry I don't own a Uno (R1 or R2) to help with the diagnosis. I hope we get a independent validation (reproducible) of the bug and a explanation/resolution of the cause.
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