Hunting - no materials / resources

Game mode: [Singleplayer]
Problem: [Bug]
Region: [EU]

Hi, i have a problem with getting resources from animals (like meat, leather, bones).
I kill animals (crocodiles, antelopes, rabbits and others) but they do not have any materials / resources.
I only play a few hours and I do not have a developed my character (actually 15 lvl).
It’s a bug? Is any solution?

You need to hack up the corpse with a tool, like a hatchet or a pick or (later) a skinning knife.