Potion effect not being applied

[Leocraft-LP]

Trying to make potion with healing, one with strength and so on, with the help of this site: https://github.com/BedwarsRel/BedwarsRel/wiki/shop.yml in the potion section.
I am running the server on version 1.8, so I tried it with the damage in the meta at first, picked the metanumber of the effects on the potion, I only had a water bottle.
- price: - type: IRON_INGOT amount: 7 reward: - type: POTION meta: ==: ItemMeta meta-type: POTION display-name: Geschwindigkeit damage: 8194
Then I tried the basic way for 1.9+, still only have a water bottle.
- price: - type: IRON_INGOT amount: 5 reward: - type: POTION meta: ==: ItemMeta meta-type: POTION display-name: Heilung II potion-type: strong_healing
Then I tried the advanced option or in other words: I created a custom potion (again only for 1.9+), which worked. The problem with this: The color is still water so you can't distinguish a strength potion from a healing potion.
- price: - type: IRON_INGOT amount: 3 reward: - type: POTION meta: ==: ItemMeta meta-type: POTION display-name: Heilung I custom-effects: - ==: PotionEffect effect: 6 amplifier: 0 duration: 1 ambient: true has-particles: true
(the spacing is not displayed correctly here, it should be correct in the config)

So I have 2 questions: Why is the 1.8 option not working? And why is exactly the advanced way of 1.9 working while the basic one (with color) isn't?