Arelith

Hi there. Looted a potion of speed from a diggable chest and later saw it did not stack with the rest of the ones in my INV So I just drank it to remove it from my Inv. I did not haste me but then I went to rest and sobriety was on the list and that is when I realized it was miss labeled. The Digger chests are one time now so no one could have put it in there. Here is a SS of it.

I don't believe this is a bug, sometimes you'll get bad potions of speed the descriptions of which read "it went bad" or something along those lines.

Its intentional and functions as alcohol. Notice your ticks going down. That being said, is the item necessary? Probably not.

Yea it's like the potion of speed was so old it went bad. That's how i always seen it anyways

It's an easter egg, just like a Potion of Speed in Baldur's Gate that only makes the imbibed character intoxicated instead of having the desired effect.