Armoured Bearger despawned when I ran too far from it.

Besides the armoured bearger despawning when I got something like 20-30 tiles away, next autumn the next bearger kept growling and failing to spawn every few days. Checked with commands that there is no spawned bearger nor armoured bearger. I spawned a normal bearger with c_spawn, killed it and its armoured counterpart which made the despawned armoured bearger come back where it despawned with its damaged health from last autumn.