Impact of a reset pin higher than VDD
Likely: some diode in a transistor becomes reverse biased and the reset pin feeds into the power rail, which can sink more current than the transistor.
The datasheet should answer this in the &quot;Absolute Maximum Ratings&quot; section, typically digital I/O pins like a reset pin will list something like &quot;Vcc + 0.3V&quot;, which both limits the voltage during operation and also implies that the pin may not be driven if the IC's supply is off.