-Settings (general) "rotate images according to exif orientation tag" to "SET"
-Use Face tag add-on to add a person, and save.
-Open again Face tag add-on , the region seems to be wrong.

But if you open this photo in view mode , the right region is displayed . (View, display region names enabled)
-Set (general) " rotate images according to exif orientation tag" to "OFF"
- Face tag add-on displays correct regions.