Anvil's damage no longer random

Anvils no longer seem to have random damage. It goes straight from slightly damaged to damaged and then very damaged and then poof! Gone. So far I've gone through 3 anvils in a very short space of time. This is a new 1.13 world. In my old 1.12 world I've still got my original anvil, that I've had for ages. In 1.13 the damage randomiser is definitely off.