Villager/Iron Golem run to world center after the village destroyed

I noticed that they will be moving toward world center of x0,y0,z0 after the village destroyed. I have tested up to 2000 blocks away. Is this WAI, bug, or missing code to define IF conditions?

What to expect:

When bed is destroyed, villager will move around looking or trying to reach for village boundary for few seconds and become neutral if there is none.

What happens:

After the last bed is destroyed, they will be moving straight to the world center if there is no village nearby. Continued moving on world center.