Malaysia 50 Cents 2011 'Shattered Die'?

That die was very close to failure. The key to a Retained Cud is the presence of a shift between the parts of the die affected. On the lower die crack, the fields are at the same level on either side of the crack- that area was cracked but still fully attached to the rest of the die. The Retained Cud shows a shift in the broken piece with that area raised slightly higher on the coin. That shift is due to the broken piece of the die sinking in relation to the rest of the die and most likely broke off completely in the next few coins struck after your example.