I think the issue is that the PSE Organizer doesn't use industry-standard metadata fields for storing the recognized face regions. It does write the person keywords in a standard way, and LR will import those, but the rectangular face regions are omitted. (I verified this withy my PSE 12 -- I don't have PSE 13.)
It looks like this is a long-standing issue with PSE. See these threads in the official Adobe feedback forums:
Adobe helped define the industry standards for this 5 years ago, but they never invested the effort to bring their consumer tool into compliance. I'm sure the information is accessible in the Organizer's database, but you'd need a programmer to pull it out.