I have thousands of test images. I can run a test to see if it pops up on any of them. The easiest way to test is make a preset with face size at 100, X at 50, Y at 50. Then if should crop exactly from chin to top of head. It makes it east to see it it badly misses either the chine or the tope of the head.
There isn’t much I can do about it when it misfires though. I didn’t actually create the Face Detection AI. I’m just using Adobe’s Face Detection that is already built into the Liquify tool….. without actually applying a liquify effect. I found a “sleight of hand” method to utilize it.