It does happen sometimes, like for now with my hens, I'm seeing it a lot lately. I think if there is some stress involved, that it's more likely. My bird's stress has been that I added a new hen (#4) and they had to do an internal reorganization, and these four chooks had to shuffle the hierarchy in the flock. Just now, I notice #3 hen lay a soft shelled egg in the yard and allowed the three others to go for it - and they did, but she left it for them and went off like it was a gift for them, or some kind of payment or something.
I'm still trying to figure chicken psychology out.