Well, I'm italian and I don't speak good italy... So any hostile mob isn't affected from potion effects. This is for the Lingering potions and the Splash potions.
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So first sorry for my absence, I was so busy with school and my family. So I post here two gifs, where in the first you can see I used a poison potion on a cow and a skeleton. How you can see the cow suffers the damage, but the skeleton don't produces particles, so it doesn't is affected. In the second one, you can see i throw a speed potion and this time the skeleton produces particles as the cow do. I'm in the version 1.9, but I think you've already resolved this bug. So sorry for the eventual waste of time and thanks you for your help.
GIF: POISON EFFECT: http://imgur.com/3lLMQ5N
GIF: SPEED EFFECT: http://imgur.com/okfZD6K
Spiders, cave spiders, skeletons, zombies, zombie villagers, husks, wither skeletons, strays, withers, zombie pigman and ender dragons are not affected by poison.
Please provide some screenshots.