Drinking the beer that shrinks you then getting on the bartenders counter clips you into the terrain and makes you stuck if you grow back to normal size while on the counter

I drank underhill and stood on the drinking bar, when I grew again I was stuck. Also sometimes the ally dwarves don't display in my UI at the bottom left even though they're present in game.

if you drink the beer that makes you small and go into the bartenders area and get big you can get stuck-

Drinking the beer that shrinks your dwarf to be smaller allows them to get behind the bar. If they are there when it wears off, they are stuck and unable to leave.