How to add another class to YOLO26n-pose without catastrophic forgetting of the person class

[Spencer_A]

Hello, I am trying to apply transfer learning to a YOLO26n-pose model for it to learn a new class with no keypoints, basically treating it like object detection. I cannot use two models for my architecture and must run on the pose. When I try to train my model, I freeze all layers except the head (I apply freeze 22). My model begins to learn the new class, but the person class is either not showing up or shows up in stiff positions (positions the people in the data were in) and are not fluid like how they are from the out of the box model that I trained on. I labeled people in my dataset. I was wondering how to resolve this issue.