I threw a helper at my lane shop to buy items for me. It hit the ground then just stood there doing nothing. It didn't shoot anything, didn't move. It never came back on its own, and Rem apparently has no way to recall his helpers. I finally got him back when I died.
Yeah, the helpers interaction with the shop seems to be very buggy. I can get it work in the Hideout and sandbox but when I tested in a game they just got stuck