What happened to this chick/egg?

[AYoung90]

I have a Cream Legbar on eggs that have started hatching.... this was the first egg to "hatch". I found it dead like this & mama hen had buried it under the bedding. Did something cause it to hatch only halfway & then die? Does this just happen sometimes?

This is my second attempt at having a broody hen hatch eggs. The first time, the mama hen (a different hen, not this Legbar) started attacking her babies & I had to put the rest in an incubator to hatch. So I'm hoping THIS mama hen will behave & do her job

 

[JacinLarkwell]

The egg was stepped on. If it happened during popping, the chick likely was crushed or the membrane then dried our too much and it became stuck and suffocated since I don't see a beak

 

[New duck mommy 2021]

I agree it looks crushed more then hatching
Hopefully it was just an accident and this mom will do much better for you