I checked images on-line of Paropsis and Paropsisterna, and the closest thing I saw was Paropsisterna beata, of which there are several sightings on Canberra Nature Map. However, if yours is this species it is a rather faded specimen, or newly emerged and hasn't developed its full colour yet.
I think it's either Paropsisterna or Dicranosterna, but it's not one I'm familiar with. I checked it against Martin Lagerwey's gallery at https://sites.google.com/site/leafbeetlesofaustralia/, but couldn't find a match. Interesting.
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