I found this photo on a website that teaches beekeeping classes and sells honey, hives, etc. They are TF.
It looks like PMS and maybe the beginning of AFB. I am hoping someone with more experience with AFB can help. I don't want to cause a panic by telling them they have AFB or getting a cussing for sticking my nose where it is not wanted.
There are more photos of brood with sunken caps that are identified as capped honey.