So this bums me out, but looks like Nikon expects this decreased AF performance in N-log. Per the N-log documentation on their support site:
http://download.nikonimglib.com/archive3/ZKTLs00cUoBu03O1M0g85H1FxC74/Z7_TG_N-Log_(En)01.pdf
So it sounds more doubtful they will attempt to address this in future firmware. Let’s hope Prores Raw doesn’t have this behavior as was said earlier.