Zombie path finding AI is slow and "broken"

THERE IS A WORLD DOWNLOAD TO DEMONSTRATE THIS!

I have a villager and a zombie, when I teleport the villager once, the zombie goes for it, when I teleport the villager back half-way through the zombie's travelled path to the villager, the zombie will go to the villager's old location first, then only go to where the villager's updated location is.

World Downloads:
[1.13+] https://goo.gl/HNfPPK
[1.9 pre4] https://goo.gl/iiCfsR

Note: I have left notes under control panel so you know what to do. I thought this would've been easier for you guys, rather than recreating the whole system

EDIT 1.12-pre7:
Now, when you teleport the villager that the zombie is tracking to one place, and then teleport the villager back, mid-zombie's path, the zombie will TELEPORT to that villagers old position, then carry on his way to the second position. It is even more broken than before.