I also have the same bug. The best workaround I found is to finish the harvest animation that plays when you do shift+right click, and then if the box does not show up, you walk around the corpse and JUST right click it constantly, basically spam the right click while walking in circles around the corpse. This always gets the dialog box to open for me after 5-20 seconds of trying. Its annoying for sure, but I've always managed to get the rawhides/meat/fat this way.