Alright, I think I fixed it.Can't think of anything; I even attached it to plain ol' Wood blocks a couple of times, and forged a new Iron Pickaxe in case my Nebula Pickaxe was doing something weird somehow. Same result. The banners came off one at a time all right, but when I hit the Banner Rack itself, it just vanished in woody particles. I didn't see it coming off the Wood blocks, as in the gif, and it didn't show up in my inventory.