Strange, on the ESP32CAM shown the pin is labeled GND/R which suggests its actually connected to EN\Reset on the ESP32, so the board can be used with one of those USB Motherboard thingies fo programming, which ground that pin as a reset.
Ya
I measured continuity to circuit GND (and ESP shield case), it measures 0 ohms 
I got 15 of these Cameras modules from China, maybe that's why.
There might be a jumper option somewhere on the PCB to cut and then solder for a RESET option.
Used a 50X microscope to see if there was one, but none visible.
I absolutely hate black PCBs.
I have not seen one, either.
Oh the joys of cheap PCBs from the far east.
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Where is the magic resistor on the PCB ?
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Well maybe.
The ESP32CAM I checked that has the GND\R pin does have a row of 6 SMT resistors as shown.
But the one I checked that has the pin labelled GND, only has a row of 4 SMT resistors in that location.
So some ESP32CAMs may be able to have that pin confugured as GND or Reset and some cannot.
Checked with my CAM Module marked as GND/R. You findings are correct. There are solder posts to move the 0R resistor.
So there are different ESP32CAMs;
The ones with the pin next to UOT which is labelled GND/R that can be configured to have that pin act as a GND or EN\Reset.
Then there are ESP32CAMs, maybe the older ones, where that pin is directly connected to GND, no options.
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