I can confirm this issue with the canteen too.

I can confirm too but i lay down when i have DRINK ALL

I have updated the description for canteen and for drink all.

Can someone confirm only for drinking a portion?

I Confirm with a bottle

same issue, but when i stand im in a frozen position, and to other i look broken, happens when drink all with canteen or water bottle.

This is a known issue, it's in the patch notes.

I get this with both the canteen and the bottle when selecting "drink all". And he doesn't lay down he falls down hard. To get up I have to first move using wasd and then hit my stand up bind. only hitting the stand up bind won't work. This have been annoying a few times when getting zombie aggro while doing this lol

This only happens when Drinking all. Crouch and drink all and it wont do the animation.

Yes, i wanted to add that. Drinking all when crouching doesn't cause the fall

Already reported,

https://www.youtube.com/watch?v=Gk05NKUzMig&feature=youtu.be

I confirm this (drinking all from a bottle). Character falls down but isn't inconscious.

Still happens. Confirm.