I have noticed that the my PanV3 all have issues with detecting motion within the DZ when the Track Motion option is turned on. I have had to turn it off to make the cams moderately useful.
When it is turned off, the DZ seems to be what I would describe as a “soft” edge. It acts like the edge of the DZ, rather than being pure On and Off, is a progressive fade from On to Off. I have taken to adding blocks to the edge of the DZ to minimize detections that I don’t want in heavy traffic areas like the street. It was discussed in several other threads by other users.