Re-detect deleted faces in Lightroom

Question

Hi, 
 
I have had Lightroom CC (v7.0, desktop) run facial detection on all photos. That seems to have worked more or less fine. However, I'm having trouble going further than naming the detected clusters of people.
 
When I go to a single photo that has faces in it, I go to the Keywords section in the lower right, with the auto-generated People section above that. However, if I have accidentally deleted a face from the photo (by clicking the "X" next to the name or the "Add Name") option in that Keyword dialog, I cannot figure out how to add a face back in so that I can tag them as a person. 
 
I can manually add a keyword, but not a person/face. I realize it may be impossible to add a new face where Lightroom does not detect one at all, but is there really no way to re-add the option to name a person who has already been detected? Essentially, simply re-scan the photo for faces without deleting it entirely and re-importing?
 
This was raised in this thread a few years ago, at which point it was impossible to re-scan or re-add people, and I'm wondering if it's really still impossible to do this or if I'm missing something. 
 
Note that LR does see this person as a distinct person if I create people-based masks for editing purposes, but running that detection does not seem to influence whether they show up in the People/keyword organization section or not.
 
Thanks,
 
Michael

umlautnord · Answer

OK, I've discovered a few more things here. Hopefully this will be helpful if anyone is facing a similar issue—though my question about being able to force this/do it manually (ala LR Classic) remains.

Lightroom CC does seem to, after some time, re-add a face/person previously detected automatically after it has gone through and tried to match them to a new cluster. Essentially, "removing" the face is telling Lightroom "this is not who this person is," and it shows that by completely removing the face being tagged as a face—rather than showing "OK, this is a face, but we're working on re-clustering them."

Once it processes for a while, it will indeed re-cluster, and the face will be added again as unnamed. (I think it removes it from the cluster whether the cluster was unnamed or named.) You can then name the person. If you did remove them from a named cluster accidentally—i.e. they're the same person—you'll have to merge it back in with the named cluster in the People view.

In one case, I also found one of the clusters as a hidden "person" after removing a face from a single photo (People view, upper right three dots dropdown menu). Worth checking there, too.

So as far as I can tell, it's all on the inner workings of Lightroom's clustering and people detection. I'd love a bit more control/transparency—and again, if anyone knows about how to do that, I'm all ears—but, it seems that all is not completely lost if you remove someone. And there's still no way to say "hey, you missed a face here." On the plus side, I have found that LR CC's overall detection algorithm is much better than LR Classic's.

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