Unfortunately, that's just something game developers do sometimes. I understand that it's frustrating, but there are a lot of game devs that don't know much about communication. Or, it's that they don't want to give a definitive date in that communication for when the bugs will be fixed, so they take the wrong approach and just say nothing.
I do wish game devs would just say something like "Sorry for the wait, there are a few more bugs than I expected that still need ironing out, but I appreciate the patience for the next update".