Unfortunately we don't know the reasoning, but if it hasn't been fixed yet is because they couldn't. Yet, the update had other fixes and features that were necessary to the game, therefore they wouldn't postpone this one over this bug.
We know and understand it's frustrating, and we feel your pain as well - I'm sorry.
We've been forwarding the feedback over this matter to the relevant teams so hopefully such a thing won't happen again (or at least less often - I repeat: we'd never deploy a bug intentionally).
Thank you for your patience and understanding.