I have yet to see any photos of assassin bugs or the fruit spotting bugs that have those bulbous ends or quite so thick an attachment point to those antennae... Certainly will be interested to hear what the expert consensus is!
I guessed assassin bug based on the shape of your bug, but I was wrong. I think thickened/flattened antennae segment only shows up in photos taken on a certain angle https://www.business.qld.gov.au/industries/farms-fishing-forestry/agriculture/biosecurity/plants/insects/horticultural/fruit-spotting-bug " .... A distinctive feature of the nymphs of both fruit-spotting species is the second last segment of the antenna, which is black and conspicuously flattened...." see also https://www.brisbaneinsects.com/brisbane_coreidbugs/GreenCoonBugs.htm
You may well be right! When I was looking at it yesterday it really seemed to stand out to me as having that thickened section and I thought it was the same in all the photos I took (with my phone) so only uploaded the clearest one.. But I do seem to have another angle and have just uploaded that.