I'm farming in low Champ, I'd say I see it on 1/4 raids or so. I've gotten pretty good at guessing which ground x-bows are actually ground (you see the same base layouts a lot), but people have gotten pretty good at using the bug to their advantage and pretending that they aren't, so I do get unpleasant surprises every now and then.
we needed cheap barbarians? no we needed xbows fixed! this is third patch since they acknowledged the bug...
Its not game-breaking like a gem glitch which also had to be rolled back, making the culprits victims who would actually prefer it get sorted out quickly.
Also we have been told that it requires the game to be updated and we would need to download it again, meaning it would have to be passed through apple and google as well, with god knows whatever other technicalities. A lot of work just to solve a non-game-breaking glitch slightly earlier.