When you creep in a direction you can't normally move and have autocreep on you get two echos: "you can't creep in that direction" plus the normal one you'd get if you weren't creeping. Seems kind of spammy since each one conveys basically the same information.

Similar thing if you try to autocreep onto water and don't have a boat. You get the "there's no cover there" echo plus the "you don't have a boat dumbass" echo.