Rather than fragmented groups, get your Australiana posting in at the Aussie Zone Communities. No affiliation other than living in Australia.
Has cities, sports, politics so far and will add more as needed. It even has Perth and thankfully no Tasmania.
Mine is having the same issue. I checked with some other communities and it didn’t seem to have that error. Can you check another instance and see if it’s the same?
Could have been a federation error?
It’s fine from the point you join though.