When I changed the Follow Range tag of a zombie to 0, the zombie no longer chased me. I tried this on other mobs, but I found that Spiders, Slimes, angry Zombie Pigmen, Silverfish, and Enderdragons are unaffected by the tag's value, and will always follow me with their default range.
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I have confirmed that the Follow Range tag works on all mobs except the five listed above (I added Enderdragon to the list). Mobs with ranged attacks, such as normal Skeletons, Witches, Blazes, Ghasts, and Wither Bosses, will still attack you if you get near, but they won't follow you, which means that they obey the tag. I think this bug is because either Mojang hadn't finished reprogramming these five mobs, or they never intended for these mobs to be affected (or it's also possible they simply forgot or made a mistake).
Alright, thanks for the info, I too was curious which were affected but couldn't test at the moment. I will assume they aren't finished yet, or over looked it.
I noticed something else while experimenting with this tag. Hostile wolves with a Follow Rang Tag of 0 obey the tag and won't follow you, but they will attempt to reach you by jumping towards you, which I found quite amusing. I'm not sure if this was intended, or if it's another bug with this tag.
Sorry that I haven't tested it in the newer versions, I've been busy lately and completely forgot about this. I have confirmed the bug still exists.
This ticket has been marked as a duplicate of MC-32579, in favor of the more general or better information provided.
Does it work for mobs with New AI? (Skeletons, Creepers, Wither Skeletons, Witches, etc.) You confirmed it works for Zombies, which is a New AI mob, try with the same above; if they don't work, it is a bug or not yet finished, but if it does, it is possible that the old AI can't be changed, which is odd. Just experiment!