zombies not targeting like in Java

Zombies don't target in BE like in JE.
Description
Zombies in JE have their arms raised 135° (in relation to the body) like the image to the right (when they detect a target).
Meanwhile, this "bug" makes BE zombies' arms just 90° (in relation to the body) like the image to the left.
Steps to Reproduce
1. Spawn a zombie.
2. /gamemode 0
3. Let them attack you.
You'll see that their arms (before attacking) aren't raised 135° (in relation to the body).
Postscript
Is this a bug or a community suggestion?