I noticed this plant on a property in Dudley, NSW.
I asked about it on facebook NSW plant identification group: https://www.facebook.com/groups/332752936930981/posts/1986545751551683/
It looks similar to Senna, and there is Senna in the area, but these leaves were much bigger and did not have the usual yellow margin that Senna has. I notice the leaflets are mostly opposite but not all of them. This plant was about a metre in height.
Most likely suggestion was: Robinia pseudoacacia
It seems to match images: https://www.flickr.com/search/?text=Robinia%20pseudoacacia
and the description: https://keyserver.lucidcentral.org/weeds/data/media/Html/robinia_pseudoacacia.htm
But I still need to return to confirm some of the characteristics (ie alternative leaf structure, spines near base of leaves).