weird bony line on fractured foot?

I was told one of the small bones got detached from my foot (avulsion fracture) as well as a navicular and anterior calcaneal fracture. I was told it would heal on its own and i’m three weeks ish into wearing a boot and NWB. Yesterday was the first time I noticed the bony like, line almost? I’m worried it means the fracture is displaced or something, but roughly a week ago I did repeat x-rays and they said it looked stable so i’m confused. nothing major happened since except maybe a few minor weight bearing steps here and there that I was told was ok if it didn’t cause extreme pain (which they didn’t). Did this happen to anyone else? not looking for medical advice as I’m seeing a podiatrist tomorrow but just curious as to what this could be? It’s hard to think it’s the bone the broke off (it was very tiny and i couldn’t see the lump before yesterday). Is it a callus maybe?