It was fixed some time ago AFAIR, but now picking up single arrows when inventory is almost full causes “too many things” again. Sometimes it helps to walk over tile with arrow (if its the only thing there), and just press “g” (ain’t gonna work with “e”).
Yeah, after some analysis I’ve come to the conclusion that the Too Many Items error has got to go, especially considering how how close to full the inventory is isn’t always readily apparent. (Although a fix is in the pipeline to at least rectify that.)