Only 2 of my hens have feather loss on their bellies. There not broody and have never actually gone broody so idk. They seem fine but I believe one of them are laying soft eggs in the amount of weeks break. I believe the other one eats the yolk from that soft egg. Their both plymouths.
https://youtube.com/shorts/vVAa11S4tVc?feature=share
https://youtube.com/shorts/vVAa11S4tVc?feature=share