If you can get a nausea potion (by TMI or any editor) and you drink milk while the effect is active, it will stop the effect but show a portal tint.
Steps to reproduce:
1. Run the command /effect @p 9 1000
2. Run the command /effect @p clear
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i think its supposed to be like this. anyone think so too?
and this is allso affecting every version not only 13w02b...

The nausea potion isn't yet in the game.
If you use MCEdit, it is. See SethBling's Modify Potions filter.

Is it really fully implemented in the game ? I don't assume.

Reopened.
Yeah, it is. It makes your view warp as if you were in a nether portal. It's one of the custom potions. (Along with blindness, etc.)
Download Toomanyitems 13w02b (he makes it for snapshots too)
you can make a nausea potion.
the thing about the nausea potion is that it makes your screen wobble around but doesnt show the nether potal tint as if you were in a nether portal..
so the bug is that when you drink milk it does get rid of the effect but your view looks like you're in the nether portal for like .5 seconds
yes the nausea EFFECT IS in the game. you can get it how ever you like..
dinnerbone made this happen for map makers.
so the Nausea potion is in the game and it works and this is a visual bug thats been here since 1.4.2
Confirmed in 13w06a. When drinking the milk, there is a flash of the nether portal overlay and then the effect goes away.
confirmed 13w21b
Still exists.
Confirmed for 1.7.5 and 14w10c
Confirmed for 14w18b.
Confirmed for 14w21b, also happens when using /effect @p clear or /effect @p 9 0
confirmed in 1.8.1 pre 2
confirmed for 1.8-pre3
Affects 15w37a. Can also be reproduced by eating a pufferfish, then drinking milk.
Confirmed for 15w45a
I think.

Still there in 15w46a
Nope. Still bugged in 15w46a.
This shouldn't be removed, I used this one to reproduce this effect in some maps.
Can confirm that this is still an issue.
Still not fixed in the 15w47a snapshot.
Confirmed not fixed.
Still not fixed 15w47c.
Aaand really fixed.
Confirmed for 15w47c
Screenshot
I am sorry I made a duplicate on this, I'm sorry I did this
BUT...
-----------------------------------------------------------------------------------wait...
is this a bug that will never be fixed >😞
You didn't create a duplicate, you made a ticket of it missing the portal effect, which is the exact opposite of this one.