[BUG] Rocket Drone in Plants vs Zombies Garden Warfare 2 HD

In honour of the PvZ birthday Rux offered us a large variety of unique goods. But despite that, I somehow unlocked the sticker of Engineer’s Rocket Drone from the GW1 game. I assume that this drone was somehow planed to be included into sequel, but because of Captain Deadbeard, developers decided to leave it behind but left its files in the game. For some reason, if you buy Rux’s 3 new abilities, then buy any Sticker Pack (for instance, I bought Amazing Brainz Pack for 35 000 coins) a Rocket Drone will appear amongst other stickers. However, if you go into Engineer’s customisations, you won’t be able to find a new Drone ability. Quite unusual bug.